Mia Hamilton lived the perfect life with her husband, university teacher Zach, and their two-year-old daughter. But everything changed when Zach committed suicide on the same night one of his students vanished.

Five years later, just when Mia is beginning to heal, stranger Alison walks into her life, saying her husband didn't kill himself.

Fragile Alison leads Mia on a path into Zach's past, and Mia begins to think she never really knew her own husband. As the secrets revealed get darker, Alison becomes harder to read, and Mia starts to wonder - why is Alison so keen to help?

And then a piece of the puzzle appears in an impossible place, and Mia has to ask, is she losing her mind, or should she be afraid for her life?

An absolutely unputdownable psychological thriller about obsession and buried secrets, with a brilliant twist. Fans of The Girl on the Train, Behind Closed Doors, and Gone Girl will be hooked from the very first page.

Read what everyone is saying about Kathryn Croft:

'Had me gripped from the first few pages, and at no point does the story disappoint. Love a good twist? This is the ULTIMATE thriller.' The Bookshelf Blog

'A very clever, dangerous and twist-filled thriller.' Book Addict Shaun

'The fear and dread Kathryn Croft] generates is what makes her one of THE best thriller writers. The shocks just keep coming and the ending is just how I wanted to it to be. It's just perfect.'Postcard Reviews

'A full on twisted thriller which had me hooked from the first page...I quite honestly whizzed through this in one evening as once I had started I didn't want to stop reading.' Jen Med's Book Reviews

'Hypnotizing from the very first page ... so intense, that you are left reeling. I found myself flipping through the pages as quickly as I could read so I could find out what was happening.' Clues and Reviews

'Wow This book grabbed me from the very beginning ...To say this book is a page-turner would be an understatement ...Just brilliant ' Chat About Books