There must be a victim. A suspect. A detective. The rest is just shuffling the sequence. Expanding the permutations. Grant McAllister, a professor of mathematics, once sat down and worked them all out – calculating the different orders and possibilities of a mystery into seven perfect detective stories he quietly published. But that was thirty years ago. Now Grant lives in seclusion on a remote Mediterranean island, counting the rest of his days.Until Julia Hart, a sharp, ambitious editor knocks on his door. Julia wishes to republish his book, and together they must revisit those old stories: an author hiding from his past, and an editor, keen to understand it.But there are things in the stories that don’t add up. Inconsistencies left by Grant that a sharp-eyed editor begins to suspect are more than mistakes. They may be clues, and Julia finds herself with a mystery of her own to solve.

    Now one is profiling her.Rush hour, London. A packed commuter train is torn apart in a collision. Picking through the carnage, ex-special forces profiler Ziba MacKenzie helps a dying woman who passes on a cryptic message: He did it. You have to tell someone.When a corpse is found bearing the gruesome signature of a serial killer dormant for twenty-five years, Ziba is pulled into the hunt for the perpetrator. As the body count rises it becomes clear he’s on a new spree. But what’s brought the London Lacerator back after such a long hiatus? And does his sudden return have anything to do with the woman on the train?Ziba scrambles to profile the killer in the hope of predicting his next move. But time is running out. And the closer she gets to uncovering his identity, the closer he gets to destroying hers.

    But the discovery of a body floating in the whirlpool bath ends Kincaid's vacation before it's begun. One of his new acquaintances at Followdale House is dead; another is a killer. Despite a distinct lack of cooperation from the local constabulary, Kincaid's keen sense of duty won't allow him to ignore the heinous crime, impelling him to send for his enthusiastic young assistant, Sergeant Gemma James. But the stakes are raised dramatically when a second murder occurs, and Kincaid and James find themselves in a determined hunt for a fiendish felon who enjoys homicide a bit too much.