On Christmas Eve, a couple's decision to spend the holiday together leads to a series of unexpected events, including a mistaken train swap and an accidental encounter with each other's families. As the snow falls, they must navigate their way through a chaotic and festive season, all while keeping their true identities a secret.

Your Christmas or Mine?
A couple's impromptu decision to switch trains results in a surprising exchange of their Christmas arrangements, leaving them to spend the holiday with unfamiliar faces instead of each other.