When Caroline and Francis receive an offer to house swap—from their city flat to a townhouse in a leafy, upscale London suburb—they jump at the chance for a week away from home, their daughter and the tensions that have pushed their marriage to the brink. The house is stark, pared back and almost sinister in its emptiness: a blank canvas upon which they can try to start again, and rebuild what has been lost between them. But slowly, Caroline begins to uncover some signs—signs that connect to her life. The flowers in the bathroom and the music in the CD player might seem innocent to anyone else—but to her they are clues. It seems the person they have swapped homes with is someone who knows her, who knows the secrets she'd hoped to forget. . .