Bored California housewife Clea Howard meets a handsome man in her local supermarket, and is instantly smitten. Knowing almost nothing about him, she rushes headlong into a passionate affair without stopping to think about the consequences, nor to question how come the intelligent and charming Lancaster seems to know so much about her.

As the lies she is forced to tell family and friends in order to cover up the adulterous affair become ever more intricate, Clea's life threatens to spin wildly out of control. Who exactly is the mysterious Lancaster? And what is he really after?