A sheltered girl disappears in the Milan underground. Five months ago, the young, somewhat slow-witted Donatella Berzaghi vanished inexplicably from her father's apartment. Duca Lamberti, who is asked to investigate the case, is at a loss. How can a girl of such striking beauty be abducted in broad daylight from a locked apartment without attracting attention? When Donatella is finally found dead, Lamberti's investigations lead directly into Milan's red-light district.