Device 6 - The Island Mystery at the Twin Castles
by Simogo + Junkboy
A 18" x 24" reproduction of a cover for an unreleased paperback, found in large quantities in several boxes at an abandoned printing shop in Sheffield. The back cover describes the adventure of a cunning woman named Anna who wakes up on a remote island. A list of other titles such as "The Clue in the Stuffed Crocodile" and "The Talking Mannequin Cipher", suggest that there were several "Interactive Mysteries" produced in what appear to be called the "HAT series."
More information may be found at Device6.com