The Sicilian Clan
The Sicilian clan led by the old Vittorio Manalese freed condemned murderer Roger Santet. They want to steal a huge stash of diamonds from a Rome show. Tony Nicosia, the mobster's American friend, advises hijacking the delivery plane en route to New York to retrieve the rocks. Inspector Le Goff is doing everything he can to stop them. The heist is successful, but Santet is captured by the mob for his liaison with Manalese's daughter-in-law.