Bank clerk John Skillpa (Cillian Murphy) hides a disturbing past from everyone in small-town Peacock, Neb. When a train jumps the tracks and crashes into John's backyard, his neighbors discover a confused woman named Emma milling about. They rush to aid the woman they assume is John's wife, but their efforts prompt John to descend into psychosis. Only Maggie (Ellen Page), a young mother, seems to know the truth behind his bizarre behavior.