Sarah Carpenter lives in an isolated farmhouse in North Yorkshire, and for the first time after the death of her husband some years ago and her children, Louis and Kitty, leaving for university, she's living alone. But she doesn't consider herself lonely. She has two dogs, a wide network of friends and the support of her best friend, Sophie. When an old acquaintance, Aiden Beck, needs somewhere to stay for a while, Sarah's cottage seems ideal, and renewing her relationship with Aiden gives her a reason to smile again. It's supposed to be temporary, but not everyone is comfortable with the arrangement: her children are wary of his motives, and Will Brewer, an old friend of her son's, seems to have taken it upon himself to check up on Sarah at every opportunity. When Sophie disappears, it's clear she hasn't been entirely honest with anyone. And as the weather closes in, events take a dramatic turn when Kitty, too, goes missing. Suddenly Sarah finds herself in terrible danger, unsure of who she can still trust. But she isn't facing this alone; she has Aiden, and Aiden offers the protection that Sarah needs. Doesn't he?