Two women, Amanda from Los Angeles and Iris from Surrey, England, are both dissatisfied with their love lives. Amanda, a movie trailer producer, discovers her boyfriend's infidelity, while Iris, a newspaper columnist, is in love with a man engaged to another woman. Seeking an escape from their romantic woes, they meet online at a home exchange website and impulsively decide to switch homes for the Christmas holiday.

Upon arriving in their respective temporary homes, both women embark on journeys of self-discovery. Amanda, not accustomed to the quiet English countryside, struggles to relax, but soon strikes a connection with Iris's charming brother, Graham, who drops by drunk in the middle of the night. Meanwhile, Iris befriends an elderly neighbor, a famous screenwriter from the Golden Age of film, and a film composer named Miles in the vibrant city of Los Angeles. As the holiday progresses, the two women find that a change of address could potentially lead to a change of heart.