Jamie (Hynes) hasn't told his family that he and his now ex-girlfriend Emily (Lenz) broke up. After an inopportune run-in with Emily at the train station in his hometown, Jamie convinces her to pretend they're still a couple to avoid ruining Christmas for his family. Jamie and Emily engage in a week-long ruse of engaging in his family's holiday activities together. While they're stuck in his family's home together, the pair discovers their relationship might still have some potential, resulting in a very unexpected Christmas.