Murder of a Marine Biologist case file – product shot on white background showing the evidence folder.
Close-up of Murder of a Marine Biologist evidence folder with coroner’s note and witness statements.
Friends playing Murder of a Marine Biologist case file together – ideal for individuals, couples or groups.
Laptop screen marked confidential for online access to Murder of a Marine Biologist answer keys and evidence.
Detective pinboard for Murder of a Marine Biologist showing suspects, notes and linked clues.

Murder of a Marine Biologist

★★★★★★★★★★ 4.86/5 · 279 verified reviews
£19.99 Free UK Delivery
  • A full 3 hrs investigation in a box
  • 32 pieces of physical evidence: police reports, photos, autopsy files
  • Bespoke online portal: search inboxes, phone records & more
  • 1-10 players, ages 14+: solo, date night, or full game night
  • Never get stuck: free hints with progressively more obvious nudges
Bundle & Save Up to 20% off · auto-applied
This case only
One evening of investigation
2 cases · 10% off
This case + 1 more of your choice
Most Popular
3 cases · 15% off
This case + 2 more of your choice
Best Value
4 cases · 20% off
This case + 3 more of your choice
(we pre-picked the top rated, tap to swap):
Free UK Delivery Dispatched within 24 working hours Free Hints Included
Difficulty
4/5
Play Time
3 hrs
Players
1-10
Evidence
32 pcs
Case Brief · Confidential

The Case Went Cold. You're Reopening It.

BEST COLD CASE FILE GAME AVAILABLE - Murder of a Marine Biologist - A murder has been committed in Brisbane, Australia. A Marine Biologist, Trudy Erhardt has been found dead with a bullet wound to her head. Play detective to crack this gripping murder mystery game, and bring the criminal to justice. 32 PIECES OF PHYSICAL EVIDENCE - Inside the case file, you'll find newspaper articles, crime scene investigation pho...
Unsolved · Until Now
Murder of a Marine Biologist evidence spread
Evidence Inventory

Inside the Evidence Envelope

Police & Autopsy Reports

Official case documents, forensics and post-mortem findings. Every detail matters, and every detail could mislead.

Witness Statements & Suspect Profiles

Interrogation transcripts, alibis and motives. Someone in this file is lying to you.

Physical Clues & Photographs

Crime scene photos, handwritten notes, receipts, maps: 32 tangible pieces of evidence to cross-examine.

Online Evidence Portal

Log in to bespoke websites: search a police inbox, read phone records, dig through what the file doesn't show.

Hint System

Free hints for every case, giving progressively more obvious nudges from gentle prod to major lead. No spoilers until you ask.

The Solution

Submit your accusation online and get the full story. Did you catch the killer, or did they walk?

The Process

Solve It in Three Steps

01

Open the file

Break the evidence seal. Lay out the reports, photos and statements. The investigation starts the moment you open it.

02

Follow the evidence

Cross-reference clues, check alibis against phone records, and dig deeper through the online portal.

03

Name the killer

Make your accusation and submit it online. We'll tell you if you cracked it, or exactly how close you got.

Cryptic
Promise
Guaranteed

You Will Never Be Left Stuck

Every case includes a free hints system, with progressively more obvious nudges, and a full solution reveal. If the case arrives damaged or anything's missing, we'll send you the missing evidence, no quibbles.

The Verdict

A Night In, Measured Fairly

Cryptic Killers Escape Room Cinema Night Other Mystery Games
Cost for two people £19.99 total £50-£70 £30-£45 £25-£40
Entertainment time 2-3.5 hours 1 hour 2 hours 1-2 hours
Physical evidence to handle ✓ 32 pieces ✓ ✕ Varies
Online evidence portals ✓ Every case ✕ ✕ Rarely
Play from your sofa ✓ ✕ ✕ ✓
Free hints if you're stuck ✓ Free hints Costs time ✕ Rarely
Your Next Case

Detectives Also Solved

Case Notes · FAQ

Questions, Detective?

This case is rated 4/5 difficulty and takes around 3 hrs to solve. If you're new to case file games, our 3/5 cases are the best starting point: this one sits in the satisfying middle: challenging, but crackable.
1-10 players works best. Solo detectives love the focus; couples make it a date night; groups split the evidence and argue about suspects. There's no turn-taking: everyone investigates together.
Every case includes a free hints system that gives progressively more obvious nudges, from gentle prod to major lead, plus a full solution reveal. You'll never be left hanging.
Each case is a one-time experience, like an escape room, which is exactly why the bundle discount exists. Most detectives finish one and immediately want the next: 2 cases save 10%, 3 save 15%, 4+ save 20%.
Orders are dispatched within 24 working hours, then delivered by Royal Mail Tracked 48 within 2 business days, with free UK delivery. It ships in a discreet evidence-style envelope, perfect for gifting.
Witness Statements

What Detectives Said

Customer Reviews

Based on 279 reviews
88%
(246)
10%
(28)
1%
(4)
0%
(0)
0%
(1)
100.0
A
Anonymous

It was my husband and mine first Cryptic Killers game we played. We enjoyed a lot. And we kept playing more and more detective games. So far Cryptic Killers are the best written detective games for us. I would like to give special thanks to the team who created this game.

A
Anonymous

Great game! First time playing and we enjoyed going through the materials to rule out suspects. It was a well thought out puzzle and we will be getting more.

A
Anonymous

Such a fantastic way to spend an evening!
Challenging and fun, I would definitely recommend and can’t wait to do more of these!

A
Anonymous

Really well done. Very thorough and very good quality resources. Thoroughly enjoyed doing this - would highly recommend!

E
Elise

We had a great evening solving this case! We both throughly enjoyed that experience and managed to crack the case in around 3 and half hours. Would definitely recommend and can’t wait to have a go at an another!

Elise & Aaron

123
Murder of a Marine Biologist