can never quite grasp. He speaks to a beggar. He saves a woman from a gang on a darkened alley. He takes his photos ... but only as he develops the negatives does he see the magical, hidden world he has brushed up against in all its beauty, and menace, and danger. And deep in those negatives is the clue he needs to continue his search: a midnight, moonlit market in the secret heart of London, where everything is for sale and anything is possible ...