Est. 1923
The Casebook
A mystery in the golden age tradition
Every case is generated fresh by AI — no two mysteries are the same. Gather clues, interrogate suspects, and name the culprit before time runs out.
Choose your style
Agatha Christie
Sherlock Holmes
Edgar Allan Poe
Dorothy Sayers
Victorian Noir
How it works
01
Examine physical evidence left at the scene
02
Interrogate suspects — each has something to hide
03
Name your culprit before the clock runs out
Case · Classified
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Preparing your mystery...
Suspects — tap to select
Your notebook
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Physical evidence
Interrogate — 5 questions remaining
Select a question above to interrogate a suspect.