Best mates Mark and Pete board a train to London for their lads night out.

As Pete finds a seat he notices a girl sitting on a bench. She looks sad and lonely. When the train leaves, he can't get her out of his mind because in her, he has seen a glimpse of himself.

Over the coming months Peter sees the girl often, but when tempted to speak to her, his courage fails. Then one day, she simply disappears. Hopelessly besotted by this girl who he believes to be his kindred spirit, Pete will not rest until he finds her.