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.
20th century computer games designer Scott exchanges love letters with 19th century poet Elizabeth Whitcomb through an antique desk that can make letters travel through time.