The Ashgrove Casebooks
Six mysteries and a Christmas Special.
Each a detective story in thirty puzzles
From a locked strong room in Kent to a vanished plate at Vesper Observatory, work through logic grids, codes, timelines and witness statements. Every answer opens the next scene.
The cases
Casebook One
The Ashgrove Casebook
A locked strong room at Ashgrove Hall. Four-by-four grids and classic codes.
Casebook Two
The Wicken End Affair
A strongbox full of sand on the down mail. Larger five-by-five grids and harder codes.
Casebook Three
The House With No Lock
A fatal cue at the Paragon Theatre. Investigate as Octavia Rook with five-by-five grids and classic codes.
Casebook Four
The Bell at Blackwater Wharf
A locked office and a bell that rang late. Follow Octavia Rook through grids, codes, timelines and witness statements.
Casebook Five
The Last Round at Gorse Hollow
A chairman dead beside the seventeenth green and a recall gong that sounded too soon. Octavia Rook returns, with new golf scorecard puzzles.
Casebook Christmas Special
The Stolen Star of Hollinsford
Christmas Eve, 1899. The lamps round the market tree go dark and the gold star vanishes. A festive Octavia Rook case at a seasonal price.
Casebook Exclusive
The Last Light at Vesper Observatory
A vanished photographic plate, an injured director and a red light with an unsafe alibi. An app-only Octavia Rook investigation.
Pay per case — no subscription
Scenes 1–5 of every case are free. Unlock the rest with a one-time purchase, and save when you buy more than one.
One case
£3.99 / $4.99
Unlock any single mystery.
Any three cases
£9.99 / $12.49
Save about 15%.
All six cases
£17.99 / $22.99
Save 25% — includes the app exclusive.
Christmas Special
£2.99 / $3.49
Seasonal price for The Stolen Star of Hollinsford, sold on its own.
Two hints per puzzle, plus a reveal if you'd rather keep the story moving. Progress is saved to your account.
App exclusive
The Last Light at Vesper Observatory
Surrey, April 1900. A director lies injured, a photographic plate has vanished, and a red light offers an impossible alibi. Return as Octavia Rook for a new investigation, available only here.
Start the exclusive case free