Sarah lives with her husband in suburban bliss until she receives a salacious e-mail from a man called Brian. Convinced the writer is her husband, she begins to follow his requests and engages in sexual games with her husband, and then, with other men. It is only later that she becomes aware that ‘Brian’ is not her husband. And in her search for the real Brian, she slips further and further into depravity, until finally, Brian is revealed.