THE BIGGEST MYSTERIES ARE MURDER TO SOLVE . . . ''TODAY''S GREATEST EXPONENT OF PLAYFUL DETECTIVE FICTION'' GUARDIAN''One of the year''s most entertaining crime novels'' SUNDAY TIMES''When did you last read a genuinely original thriller? The wait is over'' A. J. FINN''An elegantly structured, intellectually challenging and completely unique thriller that grips like a vice'' SOPHIE HANNAH_______All murder mysteries follow a simple set of rules.In the 1930s, Grant McAllister, a mathematics professor turned author, worked them out, hiding their secrets in a book of crime stories.Then Grant disappeared.Julia Hart has finally tracked him down. She wants to know what happened to him.But she''s about to discover that a good mystery can be murder to solve . . ._______''One of the most creative detective novels of the year . . . If not of all time'' Samantha Downing''Intelligent and inventive . . . It''s the most fun I''ve had in ages'' Cathy Rentzenbrink ''So, so clever . . . Agatha Christie would take her hat off to this one - bravo!'' Sarah Pinborough**Winner of the Capital Crimes Reader Award for Debut Book of the Year**SHORTLISTED FOR THE GLASS BELL AWARD AND THE BARRY AWARD FOR BEST FIRST NOVEL