Happily married Michael and Karen Carr call the police after a failed robbery in their Los Angeles home. Before long, Officer Pete Davis arrives and helps arrange the installation of a new security system, taking extra interest in the couple's case. As a result, the grateful Carrs invite Pete over for dinner, and as one thing leads to another, they strike up an unexpected friendship. However, as the lonely policeman develops an intense fixation on the Carrs, Pete's take on friendship turns into a dangerous obsession. What happens when the cure is worse than the disease?