The Sicilian Clan
Roger Santet is just a murderer arose from prison by the Sicilian clan headed by the Vittorio Manalese that is aging. They conspire to steal a huge cache of stones. The mobster friend Tony Nicosia implies that a better way to find the rocks would be to hijack the transport plane while it's enroute to New York Since they're getting ready for that heist. The inspector Le Goff is using all of the tools that are available to thwart their plans. Santet finds himself trapped by the mob because of his relationship with the Daughter in Law of Manalese though the heist itself is so successful