Fashion photographer Fabrizio sails to an island for a shoot accompanied by his business partner wife Anna, model Margherita and Anna's sister Valeria. A radio news bulletin reports that an escaped convict has murdered a policeman and is still on the run. The group discover that their boat has broken down, and Fabrizio hitches a ride on a passing speedboat to return to the mainland to find help to repair the boat. The three women are left to explore the island and meet the mysterious Marco. They also discover the corpse of a man, which then disappears...