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.