This installment of the Modesty Blaise adventures finds Modesty and faithful friend Willie Garvin trying to get to the bottom of another of Seff's evil plots. When it is discovered that a disturbed young man named Lucifer has the ability to foresee the death of those around him, Seff recruits the boy into his gang and uses his powers of premonition to evil ends, extracting ransom from rich victims who have been told of their impending death. During the course of her investigation Modesty's cover is blown, and she finds herself trapped on Seff's island stronghold and must use all of her guile and brains to escape.