Imagine sharing your darkest secret with a stranger - a girl who isn't what she seems, and who will do anything to keep you close . . .On a hot humid night in London, Cara Jameson's busy, fulfilling life is interrupted with the sound of gunfire. Panic and terror grip the street as the air is filled with screaming and Cara is pulled roughly to safety by a stranger. Taking refuge in a storeroom, Cara huddles with her savior - Amy - and in the darkness she shares more in those hours than ever has with even her husband. When she emerges hours later, a bond forged in the trauma of that night has formed between them.Returning to work, Cara tries to put the experience behind her, but the incident has taken its toll and as cracks begin to show in her perfect life and marriage, Amy reappears, set on pursuing a friendship. Cara wished she hadn't shared everything she did in those hours of darkness. But as her life skids towards deepening violence, there is only one person she can turn to: Amy, her closest friend.'Keeps us guessing until the very last page' Liz Nugent'Intense psychological thrillers that explore emotional danger with relentless, surgical accuracy' Tana French'Like Gone Girl . . . the most gripping thing I've read for ages' Evening Standard A life-saving stranger proves to be more than she seems, with the secrets confided in her beginning to seem like a bad move, in this sophisticated crime thriller from The Boy That Never Was author.