Eliza D'Amico thinks her marriage to Louis is going great until she finds a mysterious love note to her husband. Concerned, she goes to her mother for advice. Eliza, her parents, her sister Jo, and Jo's boyfriend all pile into a station wagon to go to the city to confront Louis with the letter. On the way, the five explore their relations with each other and meet many interesting people.
A transit worker pulls commuter Peter off railway tracks after he's mugged, but—while he's in a coma—his family mistakenly thinks she's Peter's fiancée, and she doesn't correct them. Things get more complicated when she falls for his brother, who's not quite sure that she's who she claims to be.