Twelfth Knife key art: Ravenscroft Hall in the snow at Christmas 1976, a figure at the door, a skull in the red winter sky — image 1
Twelfth Knife shown on an iPad held in two hands: the key art and title on screen, on a plain grey studio background — image 2
Twelfth Knife: twelve nights, twelve accounts, one killer. A twelve-night Christmas cold case — image 3
Twelfth Knife: deck the halls with bodies — image 4

Game Highlights

age 15 plus icon
Age 15+

Best for older teens and adults

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Crack The Case

Weigh the evidence and name the killer

Distributeur:Masters of Mystery

Twelfth Knife : enquête de Noël en 12 soirs – en anglais

€18,30

Case File Game

  • Pre-Order Now – Night One Unlocks 13 December
  • Twelve Nights, Around 15–20 Minutes A Night
  • Plays In Your Browser – Nothing To Download
  • One Player Or The Whole Household

Première fois ? Voici comment ça marche

Difficulty
Difficulty: Medium
Players
Players: 1+ Players
Language
Language: English
Expected · 12 December 2026 Pré-commander

Your case is reserved the moment you order — we deliver it the day it’s released.

Game Highlights

age 15 plus icon
Age 15+

Best for older teens and adults

magnifier icon
Crack The Case

Weigh the evidence and name the killer

Dans le même esprit : Murder party de Noël : jeux et kits — ou découvrez toute notre gamme de jeux murder party.

Unité des affaires non résolues · Tableau des preuves

Résumé de l’affaire

L’affaire

Twelfth Knife : enquête de Noël en 12 soirs – en anglais

Ravenscroft Hall, Christmas 1976.

Twelfth Knife is a Christmas cold case told across twelve nights. From 13 December, a new witness account unlocks every evening. Read it, break the lock at the end of it, and carry what you've learned into the next. By Twelfth Night you'll have heard from everyone who was in the house. Then you name the killer.

Three days before Christmas, Josiah Merritt, master of the house, is found dead on the library floor. The family doctor writes misadventure on the certificate. The family lets him. The Merritts keep twelve ornamental steel knives, one brought out of the case each night of the season to carve. By Twelfth Night, three are missing. One for each death.

Twelve people wrote down what they saw. Each one saw a piece of it. Each one left something out. Read one account a night, and by Twelfth Night you'll know who took the knives.

PRE-ORDER · NIGHT ONE UNLOCKS 13 DECEMBER

Recommended Device: Any phone, tablet or laptop
Confidential
Dossier · MOM Cold Case Unit Status: Cold → Reopened

Cold Case Unit · Clearance Granted

You've been assigned the case

Twelfth Knife is a digital preorder. Your personal access code is emailed before Night One, which unlocks on 13 December. New witness accounts open each evening through Christmas Eve. Play in your browser on a phone, tablet or laptop; no physical kit is posted.

Inclusavec chaque affaire numérique

Unité des affaires non résolues · Personnes d’intérêt

The Suspects

Everyone has a story. Someone's is a lie. Open a file — the full dossiers are waiting in the case.

The Evidence

Examine the evidence

Every case is a dossier of documents, photographs and statements. Tap an exhibit to take a closer look.

Evidence log Éléments recueillis

Evidence Manifest

Suspect files, police reports, witness statements, photographs, press clippings — and a built-in hint system with the full solution when you're ready.

Analyse the evidence · Follow the leads · Name the killer

How It Works
Download your cold case file

Step 1

Get Your Clearance

Twelfth Knife is a digital preorder. Your personal access code is emailed before Night One, which unlocks on 13 December. New witness accounts open each evening through Christmas Eve. Play in your browser on a phone, tablet or laptop; no physical kit is posted.

Open the case file

Step 2

Open The Case File

Read the case briefing and meet your list of suspects.

Analyse the evidence

Step 3

Analyse The Evidence

Work through the documents — police reports, witness statements, photographs and more.

Follow the leads

Step 4

Follow The Leads

Cross-reference the clues, rule out the innocent and close in on your suspect.

Name the killer

Step 5

Name The Killer

Commit to your theory — then check it against the built-in solution.

Prolongez l’enquête

Composez votre collection de Cold Cases

Gardez une nouvelle affaire prête pour le moment où le dernier indice aura livré son secret. Choisissez deux ou trois enquêtes et ajoutez-les au panier en une seule fois.

−10% Any 2 cases −15% Any 3 cases Best rate

Des affaires pour des soirées d’enquête immersives

Composer votre sélection
Send a Masters of Mystery game as a gift — burgundy gift box with gold ribbon and wax seal

A night in for two — or the perfect gift

Cold cases make a brilliant gift for the mystery-lover in your life — a night in for two, or a puzzle to unwrap solo. Digital editions can even be sent straight to their inbox with a personal message, scheduled to land on the big day and opening to a cinematic reveal.

FAQs

Please read our FAQs page to find out more.

How do I receive my cold case file?

Twelfth Knife is a pre-order. Your personal access code is emailed before Night One, and the first witness account unlocks on 13 December. It plays in your web browser on any phone, tablet or laptop.

How many people can play?

Play alone or as a household. One access code covers everyone playing together, so the whole family can read each night's account and argue over the suspects.

How long does it take?

Twelfth Knife runs across twelve nights. Night One unlocks on 13 December and a new witness account unlocks every evening through Christmas Eve. The finale and the Reckoning open with Night Twelve on Christmas Eve. Allow around 15 to 20 minutes a night.

Do I need to print anything?

No. Every witness account and every locked door opens in your browser on a phone, tablet or laptop.

What if I get stuck?

Every case includes a built-in hint system and a full solution, so you're never truly stuck.

Can I play it more than once?

Each case has one solution, so the reveal lands hardest the first time. Plenty of detectives go back through the evidence afterwards to catch what they walked straight past — and when you're ready for a fresh investigation, there's a whole library of cases waiting.

What device should I use?

Any phone, tablet or laptop with a web browser. On iPad, add it to your home screen and it plays like an app.

What age is it suitable for?

Twelfth Knife is recommended for ages 15 and over. It is a murder mystery with mature themes, so it is best suited to older teens and adults.

Didn’t find your answer?

Don't hesitate to contact us