From the number one New York Times best-selling author of In a Dark, Dark Wood, The Woman in Cabin 10, The Lying Game, and The Death of Mrs. Westaway comes Ruth Ware’s highly anticipated fifth novel.

When Rowan stumbles across an ad for a live-in nanny, she’s looking for something else completely. But it seems like too good an opportunity to miss - with a staggeringly generous salary. And when she arrives at Heatherbrae House, she is smitten - by the luxurious "smart" house fitted out with all modern conveniences, by the beautiful Scottish Highlands, and by this picture-perfect family.

What Rowan doesn’t know is that she’s stepping into a nightmare - one that will end with a child dead and Rowan in prison awaiting trial for murder.

Writing to her lawyer from prison, Rowan struggles to explain the unravelling events that have led to her incarceration. It wasn’t just the constant surveillance from the cameras installed around the house, or the malfunctioning technology that woke the household with booming music, or turned the lights off at the worst possible time. It wasn’t just the children, who turned out to be a far cry from the immaculately behaved model children she met at her interview. It wasn’t even the way she was left alone for weeks at a time, with no adults around apart from the enigmatic handyman, Jack Grant.

It was everything.

Rowan knows she’s made mistakes. She admits that she lied to obtain the post, and that her behavior toward the children wasn’t always ideal. She’s not innocent, by any means. But, she maintains, she’s not guilty - at least not of murder. Which means someone else is.

Full of spellbinding menace and told in Ruth Ware’s signature suspenseful style, this is an unputdownable thriller from the Agatha Christie of our time.