Open the casebook
The Blackthorn House Affair
A disappearance, a disputed collection and the missing counterpart that changes the whole affair.
For adults
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Inside the story
A closer look
The flagship Detective Wallis investigation. Explore Blackthorn House, question its occupants and follow the evidence into the records wing. The expanded edition adds six locations and four connected deductions about ownership, a warning telegram and the limits of a supported accusation. Text commands, compass controls, atmospheric sound and a saved notebook let you investigate at your own pace. Existing saves retain their original edition; starting again opens the expanded case.
English-language edition · Digital access, with no postal delivery. International payments and printing