About the Dead Letter Club

The Dead Letter Club is a small Australian business, run from Toowoomba, Queensland, making fair-play murder mysteries you solve at home. Each month a new case arrives as a dossier of documents. The solution is always in the evidence.

We use AI, and we're upfront about it

Our cases are written with AI assistance. An AI model drafts each case's hidden “case bible” (who did it, minute by minute, and every clue that proves it) and the documents you read. Suspect interrogations and lab reports on the Detective plan are also AI-generated, in real time, from that case bible.

What makes a case good enough to send you is the testing. Every case must pass automated checks before release:

• Consistency: every document is checked against the case bible for contradictions in times, places and facts.
• Blind solve: three independent solvers, who see only your dossier, must reach the right culprit for the right reasons. No other suspect may fit the evidence equally well.
• Not too easy: the case must not be solvable from the first two documents.
• Fair play: every clue the solution needs must be in your dossier.

If a case fails, it's rewritten or thrown away. Only cases that pass are published.

All fiction

Every person, business and event in our cases is invented. Any resemblance to real people is coincidental. Cases are written for adults and older teens (roughly PG-13): no graphic violence, no sexual content, and no harm to children.