Lucy, a lonely transit worker, develops a crush on a commuter, Peter, who she sees every day. When she rescues Peter after a mugging, she goes with him to the hospital and impulsively goes along with a nurse's misunderstanding that she is his fiancée. The longer the deception goes on, the more Lucy grows to love Peter's warm, loving family — and the more she and Peter's brother Jack begin to develop feelings for each other.