On Valentine's Day, Sherry, a college professor, finds an anonymous love note in her locker: Be Mine. Her life has been a little askew since her only son left home, and though she has a happy marriage with her husband, Jon, how exciting is sex after twenty years with the same man? So she's intrigued, and not a little flattered by the notes as they continue, and embarks on a passionate affair. Her son's school friend, Chad is witness to the affair; her best friend, Sue, normally garrulous and chirpy, is strangely silent, and unusually, Jon is aware of the situation, adding some excitement to their own relationship. Then Chad goes missing, swiftly followed by Sherry's lover, and what has seemed a very easy game to play, suddenly spirals out of control.