A foundling, raised in the circus, Sam Lion becomes a businessman after a trapeze accident. However, when he reaches fifty and becomes tired of his responsibilities and of his son Jean-Philippe, he decides to disappear at sea. However, he runs into Albert Duvivier, one of his former employees. He comes to realise that he has ignored the important things in his life.
A game show set and filmed on the real Fort Boyard in France. The contestants have to complete in physical and endurance challenges to win prize money.
