Long after the end of the world survivors wander the fields and wastelands that once housed the cities of Britain. One such survivor, the Man, isolates himself from human contact, until he meets a young woman and the pair begin an adventure that will teach them both what it is to be human.

When she agrees to accompany her partner to visit her wealthy family, trainee nurse Anna begins to suspect that her presence may have more to do with ritual sacrifice than it does meeting the parents.