Earlier, in Paris, master thief Roger Sartet escapes from custody with the help of the Sicilian mafia, led by patriarch Vittorio Manalese. Sartet is seeking refuge and an opportunity to pull off one last heist, targeting a lucrative jewel exhibition. As tensions mount between Sartet and the more cautious Manalese, they plan an audacious airplane hijacking to seize the jewels mid-flight. The meticulous preparation involves bribery, manipulate air traffic, and a disguise scheme to evade law enforcement.

Meanwhile, the persistent and sharp detective Le Goff is hot on Sartet's trail. Le Goff intensifies his efforts, determined to bring Sartet and his accomplices to justice. As the heist approaches, fractures within the clan and betrayal threaten to unravel their carefully laid plans. The ensuing chase tests loyalties and pits authority against cunning criminals in a high-stakes game where the balance of power shifts precariously.