Enoch assumes the role of Adam, an advertising agent who catches the same train to commute from Langton to London, seeing the same familiar faces every day.
One of the train passengers is Scodelario’s character Emma, a chef on the verge of relocating to Chicago with her boyfriend.
Adam decides to break the ice one day during the Christmas season by talking with the strangers on the train among them is Ben Miller's Jonathan, Sarah Niles' Judith, Timothy Spall's Ray and Joanna Scalan’s Linda.
Adam invites each of the passengers to host their own Christmas event, leading to happy times and possibly a newfound love for Adam.
Though the movie’s premise sounds a bit absurd, it doesn’t trail too far from previous Christmas rom-com involving royal engagements or weddings and doppelgangers.