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What the critics say

Quite simply the best debut novel I've ever read.
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Brilliant in its pacing, profound in its central question, suspenseful on every page - and satisfying in its thriller ending.
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A deft, perceptive exploration of a fascinating neurological condition, and a cracking good thriller.
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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
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An exceptional thriller. It left my nerves jangling for hours after I finished the last page
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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!
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A deeply unsettling debut that asks the most terrifying question - what do you have left when you lose yourself?
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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.
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