This Christmas is an original romantic comedy, set in London at Christmas time, following Adam (Enoch) and Emma (Scodelario) on their daily commute from the picture perfect village of Langton to London, meeting the same passengers every day. When their train has broken down in the countryside, Adam - contemplating his existence, suddenly finds himself on his feet and decides to break the taboo of talking to strangers on a train and invites the whole carriage to their own Christmas party.