When the decomposed body of a young woman is found near railway tracks just outside Bristol one morning, all indications are that she's committed suicide. That's how the police want it too; all neatly squared and tidied away.

ButDI Jack Cafferyis not so sure. He is on the trail of someone predatory, someone who hides in the shadows and can slip into houses unseen. And for the first time in a very long time, he feels scared.

Police Diver Flea Marleyis working alongside Caffery.With the traumas of her past safely behind her, she's beginning to wonder whether their relationship could go beyond the professional. But then she finds something that changes everything. Not only is it far too close to home for comfort - it's so horrifying that she knows that nothing will ever be the same again.

And this time, no one - not even Caffery - can help her ...

Mo Hayder has written some of the most terrifying crime thrillers you will ever read. Her first novel,Birdman, was hailed as a 'first-class shocker' by theGuardianand her follow-up,The Treatmentwas voted by the Times one of 'the top ten most scary thrillers ever written'. In 2012Gonewon the prestigious Edgars Best Novel award.

Mo left school at 15 and has worked as a barmaid, security guard, English teacher, and even a hostess in a Tokyo club. She has an MA in film making from the American University in Washington DC and an MA in creative writing from Bath Spa University. She now lives in England's West Country and is a full-time writer.

For more information on Mo Hayder and her books, see her website atwww.mohayder.net