"Quite simply the best debut novel I've ever read" (Tess Gerritsen)

"Brilliant in its pacing, profound in its central question, suspenseful on every page - and satisfying in its thriller ending" (Anita Shreve)

"A deft, perceptive exploration of a fascinating neurological condition, and a cracking good thriller" (Lionel Shriver)

"A terrific first novel - well-written, genuinely unsettling and psychologically very plausible. Thrillers seldom come much better than this. Loved it, read it in one" (Joanne Harris)

"An exceptional thriller. It left my nerves jangling for hours after I finished the last page" (Dennis Lehane)

Memories define us.

So what if you lost yours every time you went to sleep? Your name, your identity, your past, even the people you love - all forgotten overnight. And the one person you trust may only be telling you half the story.

Welcome to Christine's life.