There’s someone at your front door – should you let them in? Find out in a riveting new psychological thriller from global sensation and #1 Sunday Times bestselling author of The Housemaid.

Who knows what the storm will blow in…

Casey's cabin in the wilderness is not built for a hurricane. Her roof shakes, the lights flicker, and the tree outside her front door sways ominously in the wind. But she's a lot more worried about the girl she discovers lurking outside her kitchen window.

She’s young. She’s alone. And she’s covered in blood.