Daniel Rathbone is a 13-year-old schoolboy in 1970s Bath when he first discovers that he can see in the dark. Stuck in the middle of a disused railway tunnel, he takes the opportunity to tell his companion on the field trip, Carey Schumacher, that he can no longer be friends with such a ginger nerd. Besides, Dan is in love with Gregory Bray. Twelve years later Dan's mother gives him a Victorian writing box that had once belonged to his father. A secret compartment is found to contain a photograph of Carey. Why?