Quite simply the best debut novel I've ever read Brilliant in its pacing, profound in its central question, suspenseful on every page - and satisfying in its thriller ending A deft, perceptive exploration of a fascinating neurological condition, and a cracking good thriller 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 An exceptional thriller. It left my nerves jangling for hours after I finished the last page So high-concept, so ambitious and so structurally brilliant. It's so rare to read a thriller that's perfect in every detail, but this one definitely qualifies! A deeply unsettling debut that asks the most terrifying question - what do you have left when you lose yourself? A truly amazing debut. The central character, Christine, is beautifully drawn. It's hard to imagine a more compelling, believable and sympathetic portrayal of a damaged human being. I loved it from start to finish