Two wholly different universes unfold in writer-director Peter Howitt's romantic fantasy about alternate realities, the reliability of subway schedules and the role fate plays in shaping our random lives. In the first scenario, Londoner Helen Quilley (Gwyneth Paltrow) squeezes through the subway doors just in time, making it home to find her boyfriend cheating on her. In the second, she misses the train and returns to her flat none the wiser.