THE BIGGEST MYSTERY CAN BE MURDER TO SOLVE . . . DISCOVER THE YEAR'S MOST ORIGINAL CRIME NOVEL

One of the year's most entertaining crime novels SUNDAY TIMES, CRIME BOOK OF THE MONTH

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

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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 . . .

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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