Gripping, twisty psychological suspense from the author of Our House, the Sunday Times bestseller & winner of a British Book Award

'A novel that redefines the term "unputdownable"' Heat

One summer can change everything . . .

In the heady swelter of a suburban summer, the Elm Hill lido opens.

For teacher Natalie Steele, the school holidays are always spent with her husband Ed and daughter Molly. But not this year.

Despite Molly's extreme phobia of water, Natalie is drawn to the lido and its dazzling social scene, led by glamorous Lara Channing. Soon she's spending long days with Lara at the pool and intimate evenings at her home.

Real life, and the person she used to be, begins to feel very far away.

But is the new friendship everything it seems?

Or has Natalie been swept dangerously out of her depth?
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'Exquisitely written and addictively dark. Sheer perfection' Clare Mackintosh, author of Let Me Lie

'A compulsive psychological thriller that will give you the shivers' Sunday Mirror

'Clever, claustrophobic' Fabulous

'Tautly plotted - a psychological drama with edge' Good Housekeeping