The New York Times bestseller and Guardian Book of the Month

'This flawless masterpiece deserves to be a bestseller.' DAILY EXPRESS

'Tough, tense and twisty - but tender, human and deeply affecting, too ... I don't have a sister, but when I finished the book I called my brother, just to hear his voice.' LEE CHILD

'An outstanding crime novel.' PAULA HAWKINS, author of The Girl on the Train
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