This compelling new psychological thriller from the bestselling author of The Second Wife begs the question: How far would you go to save a stranger?

Jess spends most of her time alone to hide her obsession: prowling the streets, looking into other people's homes, sneaking glimpses of their private lives . . .

When Jess witnesses a man standing at the sink, washing blood off his hands and a woman, nearby, with a dejected expression, a simmering anger is unleashed. She may be a loner, but Jess won't stand by when another woman is being abused, so she starts to make plans for a rescue. But what you see through a window frame is only ever part of the story, and Jess may be about to learn that you can't always trust what you think you've seen . . .