Belle, restless and sleepless, is alone in her vast new house while her husband works abroad. Dangerously idle, she invites the alluring and damaged Tina, a local waitress with a violent boyfriend, to become her lodger – even though she barely knows her.

Gradually Belle and Tina grow closer, sharing clothes, secrets, stories of their troubled pasts, and even their fantasies. But as Belle finds herself getting increasingly enmeshed with the younger woman, her presence becomes more and more unsettling. Soon Belle is drawn into a dark, erotically charged world of risk and transgression that she can’t – and doesn’t want to – control. What price will she pay for letting a stranger into her life?