Agatha Christie – Hercule Poirot: The First Cases Trophy Walkthrough

Trophy Roadmap:

Difficulty: 1.5-2/10
Estimated time to Platinum: 4 – 5 hours
Trophies: 47 1 / 4 / 4 / 38
Missable trophies: 0, with the walkthrough (Otherwise, several)
Glitched trophies: None
Difficulty related: None
Playthrough: 1

Introduction:

Welcome to the Agatha Christie – Hercule Poirot: The First Cases trophy walkthrough!
Developed by Blazing Griffin, and published to consoles by Microïds, this game follows the famed detective Hercule Poirot before he became the deductive legend we know and love today. Help Poirot to unravel a dastardly blackmail scheme – and solve a murder on the side!

Video guides of this walkthrough are fine as long as I am credited in the video and the guide linked!

Tips and Strategies:

The auto save icon is actually in the lower left corner of the screen! Make sure you aren’t doing anything while the auto save icon is on screen, just in case.

This is a long game, with no chapter select and several game-spanning trophies. At the beginning of each case, back up your save, so you can make sure you’ve done everything before fully moving on to the next chapter.

Unless specifically noted, your dialogue choices do not matter – most of the time you’ll just be exhausting the dialogue. The only time I’ve listed dialogue choices are for the defence-lowering conversations – indicated by the shield surrounding the character portrait.

A full written text walkthrough is provided below, and if you enjoy my work, please consider donating to my Ko-fi.

If you liked this guide, you’ll find more on our site.
You can also chat to our writers and friends by joining us on Discord with this link – Discord Invite

Trophy Walkthrough:

PROLOGUE: The Bracelet

Garden
Talk to Elizabeth
Use L2 and zoom the camera out.  I recommend keeping the camera zoomed out as much as possible while playing.  You’ll have to zoom out every time you change screens
Look at the muddy footprints in front of Elizabeth (1/38)
Continue to follow the tutorial
Enter the garden lawn (where the gazebo is)
Walk into the gazebo
Look at the plaque (2/38)
Leave the gazebo and walk to the other side of it
Look at overgrown grass (3/38)
Look at waterlogged patch of grass (4/38)
Continue to follow the tutorial to learn how to make deductions
Talk to Elizabeth

Mind Map
Link “intruder didn’t use the lawn” and “intruder didn’t use the path”

Click the hotspot to the left of Elizabeth (“open window”) (5/38) and (1/15)
Look at front door (6/38)
Look at overgrown trellis right of front door (7/38)
Look at flowerbed just to the right (8/38)
Look at bench (9/38)
Look at ladder (10/38)
Look at side door (11/38)

Mind Map
“open window” and “wooden ladder”
“side door” and “front door”
“no forced entry” and “no scaled access”
“no unlawful entry to the house” and “no unlawful access through the garden” – It Wasn’t A Burglary unlocked
Objective Complete!

Talk to Elizabeth x2
Enter Main Hall

Main Hall 1F
Talk to Cassandra
Continue to follow tutorial
Look at auction crate (12/38)
Look at telephone (on table against back right wall) (13/38)
Look at portrait of gentleman (14/38)
Look at collection of books (left wall) (15/38)
Try to enter left room (lounge) (16/38)
Try to enter right room (kitchen) (17/38)
Look at coat (back left wall) (18/38)
Talk to Cassandra
Go upstairs

Main Hall 2F
Try to enter right door (bathroom) (19/38)
Look at missing painting spot (20/38)
Enter left door (21/38)

Bedroom
Talk to Angeline
Look at cleaning rag (desk by door) (22/38)
Look at fireplace (23/38)
Look at jewelry box (right wall table) (24/38)
Look at abandoned poker (25/38)
Look at photograph of gentleman (on vanity) (26/38)
Look at broken glass (27/38)
Look at open window (28/38) and (2/15)
Look at rectangular dust recess (left wall, blocked by the bed) (29/38)

Mind Map – Cassandra
“strange symbol” and “quote on a plaque”
“missing painting” and “auction crate”

Mind Map – Crime Scene
“unprotected” and “broken glass”
“open window’ and “abandoned poker”

Talk to Angeline – Angeline Van den Bosch unlocked – if this trophy doesn’t unlock for you, then restart the game.  My first time through I hit a weird glitch where this and a few other prologue trophies didn’t unlock when they should have.  Note that if you do restart the game now, then all of the deduction trophies will not pop when I say they will in this walkthrough – they’ll all pop earlier, because game counts deductions across multiple playthroughs (as of patch 1.01)
Go back outside

Garden
Talk to Elizabeth

Mind Map – Cassandra
“Elizabeth confirmed spare key” and “interest in Shakespeare”

Talk to Elizabeth
Go back inside and upstairs

Main Hall 2F
Look at bookshelf next to bathroom door (30/38)
Go downstairs and enter the left door

Lounge
Talk to Florette
Look at note under left window (31/38) – Luc Piette unlocked
Look at poker stand (right of fireplace) (32/38)
Look at selection of pastries (33/38)
Look at wet parcel (34/38)
Look at personalized handkerchief (35/38)
Look at letter (next to Florette) (36/38)
Look at collection slip (on barrel) (37/38)
Look at wine bottle (38/38) – Fine-Toothed Comb unlocked
Go outside to Garden

Garden

Mind Map – Cassandra
“final demand” and “telephone”
“financial responsibilities ignored” and “selling heirlooms”
“Cassandra is desperate for money” and “valuables are insured”
Objective Complete!

Mind Map – Crime Scene
“personalized handkerchief” and “cleaning rag”

Talk to Elizabeth

Mind Map – Crime Scene
“Angeline removed soot stain” and “fallen soot”

Mind Map – Florette
“abandoned poker” and “poker stand”
“collection slip” and “address label”
“parcel was collected from tailors” and “Florette was dawdling”
“Florette was running an errand” and “Cassandra watched Florette”
“Florette had no opportunity” and “theft fits Cassandra’s insurance scam”

Talk to Elizabeth

Mind Map – Elizabeth
“note from Luc” and “bench carving”
“Elizabeth and Luc are courting” and “gold band”
“Elizabeth and Luc are betrothed” and “formal suit”
Objective Complete!

Talk to Elizabeth – Elizabeth Padget unlocked
Go back inside and into the Lounge

Lounge
Talk to Florette
Go to Main Hall

Main Hall 1F
Talk to Cassandra
Understanding
Empathetic
Sympathetic
Go upstairs and into the bedroom

Bedroom
Talk to Angeline
Look at fireplace

Mind Map – Crime Scene
“someone forced the window open” and “Angeline stashed her keepsakes”  – Little Grey Cells unlocked
Objective Complete!

Go back to the Lounge

Lounge

Mind Map – Florette
“Cassandra became aggressive” and “Cassandra previously mistreated”
“Florette is mistreated” and “Florette was scapegoated”
Objective Complete!

Talk to Florette – Florette Duval unlocked
Go back to the Garden

Garden
Talk to Elizabeth
Go through the final cutscenes – The Bracelet unlocked

CHAPTER 1:  The Blackmail

Great Hall
Look at guest book on table
Try to enter both doors left of the stairs (salon and dining room)
Talk to Zakariya
Go upstairs

1F Hall
Look at receipt (on a table at the bottom of the screen)
Look at painting on left wall (“valley with beautiful cliffs”) (1/9)
Look at group of saints painting (2/9)
Look at painting on left wall (“sun rising over a town”) (3/9)
Enter the room next to this painting

Jackie’s Bedroom
Look at changing screen
Look at window behind changing screen (3/15)
Look at perfume bottles (by record player)

Mind Map – Locate Room
“very few staff working” and “Archibald is stressed”
“locked dining room door” and “locked salon door”
“rooms for tonight’s event” and “staff are very busy”
“perfume bottles” and “changing screen”
“room prepared for female guest” and “Archibald stressed due to lack of staff”

Look at pillow
Exit to 1F Hall

1F Hall
Talk to Gedeon
Go downstairs

Grand Hall
Talk to Zakariya
Talk to Angeline
Walk behind the stairs and look at the case against the left wall (quill pen)
Walk right of Angeline
Look at tag on vase
Look at the painting (“distinguished-looking gentleman”) (4/9)
Enter Butler’s Pantry

Butler’s Pantry
Talk to Elizabeth
Look at cupboard (1/15)
Look at pots and pans (2/15)
Try to leave
Look at letter (next to pots and pans) (3/15)

Mind Map – Locate Room
“group of saints” and “plaques above doors”
“Seven Saints assigned to rooms” and “guests residing on 1st floor”
“one door missing” and “Zakariya says”

Mind Map – Blackmail Letters
“handwritten” and “quill pen”

Talk to Elizabeth
Look at house deeds (next to broom) (4/15)
Exit to Grand Hall

Grand Hall
Talk to Angeline
Talk to Zakariya

Mind Map – Van den Bosch Family
“Luc passed away” and “Elizabeth hasn’t been herself”
“Elizabeth mourns” and “Elizabeth upset Florette was dismissed”
“tag on vase” and “receipt”

Mind Map – Blackmail Letters
“staff concerned” and “madame unaware”

Go upstairs

1F Hall
Talk to Gedeon
Go to the far right side of the hall
Exit to Northeast Quarter

Northeast Quarter
Look at luggage
Look at plant
Try to enter right door
Exit to 1F Hall, then immediately right to Southeast Quarter

Southeast Quarter
Look at luggage
Look at plant in lower left (“hideous plant”)

Mind Map – Van den Bosch Family
“Angeline mindful” and “Angeline guilty”
“Angeline is trying” and “Angeline tried”
“Gedeon believes” and “family keeping up appearances”
Objective Complete!

Enter left door – if you can’t enter it, then look at the remaining items in the Northeast Quarter and Southeast Quarter.  But I think this is all you need to do.

Poirot’s Room
Look at book (on vanity)
Look at window (4/15)
Look at fireplace
Objective Complete!

Talk to Elizabeth

Mind Map – Blackmail Letters
“house deeds” and “blackmailer wishes family to leave”
“house holds many secrets” and “staff aware of blackmail”
Objective Complete!

Talk to Elizabeth – The Blackmail unlocked

CHAPTER 2: The Altercation

Grand Hall
Talk to Major
Implicating
Agreeable
Antagonising – Major Felix Hagen unlocked

Look at pamphlet (on table)
Look at note (on wall next to Butler’s Pantry)
Try to enter Butler’s Pantry
Talk to Archibald (left of stairs)
Enter Salon (large left door)

Salon
Look at bottle on bar
Look at window (back left corner) (5/15)
Look at newspaper (in front of Margaux)
Talk to Margaux
Talk to Cassandra
Talk to Zakariya

Mind Map – Meet Guests
“bottle of alcohol” and “Zakariya is intoxicated”

Mind Map – Circumstances
“hastily-arranged marriage” and “Gedeon looking forward”
“brothers have a history” and “Major doesn’t like Gedeon”

Talk to Zakariya
Exit to Grand Hall, then Butler’s Pantry

Butler’s Pantry
Look at letter (next to sink) (5/15)
Look at photograph (on table) (6/15)

Mind Map – Staff
“staff photo” and “staff rota”
“insufficient staff” and “staff termination” – Order and Method unlocked
“recent staff layoffs” and “family taking care of money”

Talk to Inge
Exit to Grand Hall

Grand Hall
Talk to Archibald
Exit to Salon

Salon
Talk to Cassandra

Mind Map – Staff
“forbidden areas” and “Archibald claims”
“staff know” and “Cassandra dismissive”
Objective Complete!

Exit to Grand Hall, then go upstairs

1F Hallway
Look at group of saints painting on left wall – you looked at this in the last chapter, but unlike the other paintings, it is showing up as a new thing to look at again, so better safe than sorry (5/9)
Enter the double doors at the top of the screen

Library
Walk to the green tables on the left
Look at the note on one of the tables
Look at the books on the other three tables (1-3/9)
Look at bookshelf left of fireplace (4/9)
Look at book on table surrounded by couches (5/9)
Look at bookshelf right of fireplace (6/9)
Look at bookshelf left of window (7/9)
Look at book on desk in back right corner (8/9)
Look at glass case behind Jackie (9/9) – Well-Read unlocked
Look at window (6/15)
Talk to Jackie
Talk to Hugo
Talk to Ernesto

Mind Map – Meet Guests
“Hugo resistant” and “Jackie dismisses”
“Ernesto helped out” and “Major supports”
“family still need help” and “layoffs related to money issues”
“Major supports” and Major’s been around”
“Major is very close” and “Jackie’s blackmailer theory”

Mind Map – Circumstances
“Gedeon had one of the Major’s cigars” and “the Major wanted to calm down”

Exit to 1F Hall, then Grand Hall, then Salon

Salon
Talk to Zakariya
Talk to Cassandra
Talk to Margaux

Mind Map – Meet Guests
“Major didn’t treat Cassaandra well” and “Margaux protective”

Exit to Grand Hall

Grand Hall
Talk to Archibald

Mind Map – Circumstances
“Major views the family” and “differing status”
“possible status drop” and “potential financial intentions”
“Major thinks the Demirs” and “the Major intneded to warn”
Objective Complete!

Go upstairs and into the Library

Library
Talk to Ernesto
Objective Complete! (Meet Guests)
Exit to 1F Hall, then downstairs

Grand Hall
Talk to Archibald – The Altercation unlocked

CHAPER 3: The Major

Major’s Study
Talk to Archibald
Look at Major
Look at damp floor
Look at burnt carpet
Look at safe
Look at dent in plaster (between the mounted animal heads)
Look at letter on chair
Look at wallet (on rug left of chair)
Look at ice bucket (left corner)
Look at window (7/15)

Mind Map – What Happened Prior
“sum of money” and “jewelry box”
“second floor window” and “valuables not taken”
“damp floor” and “remaining ice cubes”
“bucket was overturned” and “unrepaired”

Look at door to Major’s bedroom (try to leave)

Mind Map – What Happened Prior
“evidence of a fight” and “logical entry point”
Objective Complete!

Talk to Archibald

Look at coatrack (Major’s jacket)
Look at ashtray
Look at towel
Look at matchbox
Look at desk
Look at poker stand
Look at fireplace

Mind Map – Who May Be Responsible
“half-smoked cigar” and “burn mark”
“missing knife” and “single stab wound”
“very tidy” and “bucket was overturned”
“crime scene was compromised” and “clean”
“mouldy logs” and “ring of dust”

Talk to Archibald

Mind Map – Who May Be Responsible
“unused” (fireplace) and “empty” (matchbox)
“no fire source” and “evidence of smoking” – Truth From Within unlocked
“someone lit the Major’s cigar” and “killer’s entry to the room”
“Major knew his killer” and “crime scene was compromised”
Objective Complete!

Talk to Archibald

Major’s Bedroom
Look at letter (small bedside table)
Look at note (on fireplace)
Look at dresser drawer
Look at window (8/15) – make SURE you do this!  This is the ONLY time you can access this room!

Mind Map – Who’s in House
“Margaux protective” and “close to Cassandra”
“mention of helping family” and “Ernesto supports”
“Hugo’s positive work” and “Gedeon is a supporter”

Talk to Archibald

Mind Map – Who’s in House
“Cassandra has multiple admirers” and “love for Cassandra”
“multiple guests threatened” and “killer may still be”
Objective Complete!

Talk to Archibald – The Major unlocked

CHAPTER 4: The Interrogations

Salon
Go behind bar
Look at bottle – Take a Break unlocked
Talk to Zakariya
Talk to Hugo
Talk to Ernesto
Talk to Gedeon
Talk to Margaux
Talk to Jackie

Mind Map – Interrogate
“argument between Hugo and Jackie” and Ernesto was lurking”
“spoke with Jackie and myself” and “Jackie was talking to Hugo”
“Gedeon was present” and “Gedeon saw Margaux”
“Gedeon saw Margaux” and “Zakariya saw Gedeon”
“Zakariya went missing” and “Gedeon saw Margaux”
“Ernesto was lurking” and “spoke with Jackie and myself”

Talk to Zakariya
Talk to Hugo
Talk to Archibald

Mind Map – Interrogate
“Zakariya’s absence covered” and “Zakariya was briefly missing”
“Hugo saw Ernesto” and “Argument between Hugo and Jackie”
Objective Complete!

Talk to Hugo
Talk to Ernesto
Talk to Gedeon
Talk to Zakariya
Talk to Gedeon
Talk to Margaux
Talk to Jackie

Mind Map – Continue Interrogation
“Zakariya resents Gedeon” and “Gedeon feels detached”
“Zakariya resents Gideon” and “Zakariya is defensive”
“Cassandra more than a friend” and “Ernesto and Cassandra’s friendship”
“Hugo’s frustration” and “Hugo claims to have calmed down”

Talk to Margaux
Flattering
Coercive – Comtesse Margaux de Vos unlocked
Talk to Ernesto
Objective Complete! (Continue Interrogation)

Talk to Archibald

Poirot’s Bedroom

Mind Map – Conclusion
“Advice to the Major” and “Jackie claims Margaux”
“Jackie wants information” and “Hugo has dirt”
“Gedeon hesitant” and “Gedeon wrote” – Curious and Beautiful unlocked
“Ernesto cares” and “threat to Major”
“Hugo, Ernesto, and Jackie alibis” and “Gedeon, Zakariya and Margaux alibis”

Talk to Angeline – Jacqueline “Jackie” Conrad unlocked

Mind Map – Conclusion
“Jackie bumped heads” and “Jackie pushing for dirt”
“all motives confirmed” and “all alibis confirmed”
“all guests are suspicious” and “guests have known”
Objective Complete!

The Interrogations unlocked after cutscene

CHAPTER 5: The Secret

Grand Hall
Talk to Angeline
Talk to Archibald
Talk to Margaux
Talk to Gedeon

Mind Map – Major’s Involvement
“Angeline knew” and “Angeline disputes”
“Zakariya was shocked” and “Zakariya was therapized”

Talk to Gedeon – Zakariya Demir unlocked
Exit outside to Garden

Garden
Find and look at the following five items:

1. faint footprints – near the door
2. expensive lighter – near the door
3. garden tools – go right at the intersection; near a bench
4. fallen bird feeder – walk to the fountain, then left into a fenced area.  It’s against a hedge
5. milk bottles – walk to the fountain, then to the lamp and blue pot against the right fence

Once you’ve done so, look at the front gate – Sunken secrets unlocked
Once you’re back inside, exit to Dining Room (small door on left)

Dining Room
On the left set of windows, look at the right one (9/15)
On the right set of windows, look at the left one (10/15)
Talk to Cassandra
Exit right to Kitchen

Kitchen
This is the ONLY time you will be in this room!
Look at mounted animal head (7/15)
Look at open cupboard door (8/15)
Look at pots and pans (9/15)
Talk to Rehana – Well-Acquainted unlocked
Exit to Dining Room, then Grand Hall

Grand Hall

Mind Map – Major’s Involvement
“Cassandra believes the Major” and “Angeline disputes the Major”

Talk to Angeline

Mind Map – Major’s Involvement
“Cassandra wasn’t happy” and “Gedeon paid it off”

Talk to Angeline
Talk to Archibald

Major’s Study
Look at safe (sealed letter)
Look at photograph
Look at empty envelopes
Look at letter (loan)

Mind Map – Major’s Involvement
“Angeline and Cassandra” (torn photograph) and “Angeline attached to Major”
“The Major cared” and “Cassandra and the Major’s relationship issues”
“large sum” and “ransom value”
“Major paid the blackmail” and “Major faked the blackmail?”
Objective Complete!

Main Hall 2F
Look at painting on left wall (“majestic mountain”) (6/9)
Look at painting on left wall (“atmospheric forest”) (7/9)
Look at painting on left wall (“boat”) (8/9)
Look at painting on back wall (generic description) (9/9) – Exquisite Artwork unlocked
Exit to Storeroom (bottom right)

Storeroom
Look at book on right
Look at children’s toys on left
Exit to Main Hall 2F, then Cassandra’s Bedroom (back wall)

Cassandra’s Bedroom
Look at window (11/15)
Talk to Cassandra

Mind Map – Major’s Relationship
“high interest rate” and “Major resided with the family”
“Angeline and Cassandra” (torn photograph) and “Cassandra claims Major didn’t love her”

Talk to Cassandra
Exit to Main Hall 2F, then downstairs

Main Hall 1F
Talk to Angeline

Mind Map – Major’s Relationship
“previous birthday gift” and “Major returned after Viscount’s death”
“Major hasn’t helped the house” and “Cassandra has no romantic feelings”

Go upstairs to Main Hall 2F, then Cassandra’s Bedroom

Cassandra’s Bedroom
Talk to Cassandra
Forceful
Suggestive
Forceful – Cassandra Van Den Bosch unlocked
Objective Complete!
Exit to Main Hall 2F

Main Hall 2F
Talk to Archibald – The Secret unlocked

CHAPTER 6: The Search

You will regain control in Main Hall 1F.
Make SURE you’re looking at the windows in this chapter!  You will not be able to revisit most of these rooms again!
Talk to Archibald
Exit left to Margaux’s Bedroom

Margaux’s Bedroom
Talk to Margaux
Look at first-aid kit (at right window)
Look at package (at center window)
Look at left window (12/15)
Talk to Margaux
Exit the room

Jackie’s Bedroom
Talk to Jackie
(You should have already looked at this window before, but double-check just to make sure)
Look at newspapers (on right wall desk)
Look at pocket knife (right of fireplace)
Look at cluttered workstation (in front of couch)
Talk to Jackie
Exit the room

Angeline and Gedeon’s Bedroom
Look at bed
Look at photograph (on piano) – Gedeon Demir unlocked
Look at left window (13/15)
Exit to Main Hall 2F, then right to Major’s Study

Major’s Study
Look at scrapped paper (on desk) – What Else Did I Miss? unlocked
Exit to Main Hall 2F, then downstairs

Main Hall 1F
Talk to Inge – Rehana Piette unlocked
Exit right to Zakariya’s Bedroom (it’s the door to the Northeast Quarter)

Zakariya’s Bedroom
Talk to Zakariya
Look at cigarette butts (on vanity)
Look at ceremonial dagger (left of fireplace)
Look at middle window (14/15)
Talk to Zakariya
Exit room

Hugo’s Bedroom
Look at notebook (left of clock)
Look at note (fireplace)
Look at middle window (15/15) – Room with a View unlocked
Look at photo (on globe)

Mind Map – Search Guest Rooms
“Zakariya is hesitant to reconcile” and “photo of Gedeon”
“scrapped paper” and “Jackie thinks Hugo”
“Jackie unlikely to collaborate” and “Hugo’s notebook”

Exit room

Ernesto’s Bedroom
Talk to Ernesto
Look at letter (right of fireplace)
Look at letter (chair)
Look at letter opener (desk)
Talk to Ernesto
Straightforward
Concerned – Ernesto da Silva unlocked
Continue to exhaust conversation with Ernesto

Mind Map – Search Guest Rooms
“partially-signed contract” and “Hugo may collude”
“Ernesto employed servant” and “Hugo and Ernesto unlikely to collude”

Mind Map – Investigate Blackmail
“Ernesto employed a servant” and “Inge got the job”

Talk to Ernesto

Mind Map – Search Guest Rooms
“Margaux approached Ernesto” and “Archibald allowed Margaux” – Instinct is Marvelous unlocked
Objective Complete!

Exit to Main Hall 1F

Main Hall 1F
Talk to Inge

Mind Map – Inge
“Inge previously prosecuted” and “Inge following Margaux”
“Inge is assisting” and “Archibald lost key”

Talk to Inge – Inge Frank unlocked

Mind Map – Inge
“Inge stole Archibald’s key” and “Inge accessed safe”
“Inge is trying to uncover secrets” and “Inge knows hidden room”
Objective Complete!

Talk to Inge

Mind Map – Investigate Blackmail
“Van den Bosch secrets” and “Margaux has links”
Objective Complete!

Quit the game and BACK UP YOUR SAVE.  There is a chance you could encounter a game-breaking glitch at the very beginning of Chapter 7, and you want something to come back to just in case.  If you don’t get a new mind map at the very beginning of Chapter 7 before you even regain control of Poirot, you have encountered the glitch.

Poirot’s Bedoom
Talk to Angeline – The Search unlocked

CHAPTER 7: The Family

Poirot’s Bedroom
Exit to Southeast Quarter, then 1F Hallway
After cutscene, exit to Library

Library
Talk to Hugo
Curious
Direct
Honest – Hugo Beckers unlocked
Exit to Main Hall 1F, then downstairs, then all the way right to Staff Quarters

Staff Quarters
Look at logs (10/15)
Look at newspaper (by lamp) (11/15)
Look at hammock (12/15)
Look at cupboard (13/15)
Look at luggage (14/15)
Look at abandoned clothes (between left and middle beds) (15/15) – Work-Life Balance unlocked after loading screen

Butler’s Pantry

Mind Map – Archibald and Rehana
“Rehana claims” and “Archibald staged”
“Major’s coat” and “Hugo saw the Major”

Talk to Archibald
Talk to Inge
Talk to Rehana

Mind-Map – Archibald and Rehana
“worn-out boots” and “Madame pays staff” (Archibald)
“staff member’s boots” and “someone else wore Major’s coat”
“Rehana unsure” and “Archibald forgot”
“Archibald and Rehana unsure” and “staff covering for real time of death”
“Archibald and Rehana fabricated” and “staff member impersonated”
“staff are hiding” and “staff may be involved”
Objective Complete!

Back out for new Mind Map

Mind Map – Association
“Inge feels disconnected” and “staff are involved”
“Elizabeth mourns” and “Rehana distraught”
“Elizabeth looked white” and “staff are involved”
“Elizabeth found body” and “Rehana helped Elizabeth”
“Rehana wasn’t seen” and “staff member impersonated”
“Rehana wasn’t seen” and “Archibald staged”
“Archibald was covering” and “Elizabeth found body”
Objective Complete!

Poirot’s Bedroom

Mind Map – Investigate Murder
“Rehana was covering” and “Archibald staged”

The Family unlocked after cutscene

CHAPTER 8: The Truth

Poirot’s Bedroom
Exit to Southeast Quarter, then Main Hall 1F, then upstairs, then Storage Room

Storage Room
Talk to Archibald
Look at detached saint carving

Mind Map – Archibald
“detached saint carving” and “Van den Bosch secrets”
“secret room accessible” and “Archibald hid items”

Look at left wall next to cabinet

Hidden Room
Well-Travelled unlocked
Look at military service box (desk)
Look at expensive lighter (safe)
Look at letter – Viscount Edwin Van Den Bosch unlocked
Look at military knife

Mind Map – Archibald
“blood stains” and “potential murder weapon”
“rose engraving” and “unrecognizable symbol” – Thinking of Everything unlocked
“military lighter” and “Major’s lighter”

Exit to Storage Room

Storage Room
Talk to Archibald

Mind Map – Archibald
“Archibald in garden” and “open window”
“Archibald collected something” and “Major’s knife is murder weapon”

Talk to Archibald – Archibald Sterling unlocked
Objective Complete! (Archibald)
Talk to Archibald

Poirot’s Bedroom

Mind Map – Elizabeth
“Major paid blackmail” and “Major killed prisoners”
“Major not receiving pension” and “Major bad financial state”
“Major was desperate” and “Ernesto paid Major”
“Major needed to ensure” and “security attacked”
“Major ordered attack” and “Luc died”
“Major’s orders” and “Elizabeth is the murderer”
Objective Complete!

Talk to Angeline

Major’s Study
Talk to Elizabeth x2

Mind Map – Investigate Murder
“defensive strike” and “Elizabeth stabbed”
Objective Complete! – Well-Prepared unlocked

Talk to Elizabeth
The Truth unlocked after cutscene

CHAPTER 9: The Denouement

This chapter is just a lot of talking – the classic scene of the detective laying out the entire case to the suspects, interspersed with you doing several of the defense-lowering conversations.  You need to do all of the conversations perfectly for Probably the Greatest Detective in the World.

In order:

Jackie – Accusing / Forceful / Disgust
Hugo – Direct / Sarcastic / Sympathetic
Ernesto – Direct / Straightforward / Assertive
Cassandra – Suggestive / Antagonizing / Sympathetic

I Like an Audience unlocked after doing all four, whether you did it flawlessly or not.
The Denouement and Super Sleuth unlocked after ending cutscenes