A serial killer holds New York in his grip. He does not choose his victims. Nor does he watch them die. But then there are too many of them for that. The explosion of a skyscraper, followed by the casual discovery of a letter, lead the police to face up to a dreadful reality: some of New York's buildings are being mined. But which ones? A young female detective and a former press photographer are the only hope of stopping this psychopath. A man who does not even claim responsibility for his actions.