Alain is a boxer in 1925 Marseille, France. When he doesn't take the dive paid to take by a mob boss, he has to split. He joins the Foreign Legion and is sent to Morocco. He makes 3 friends and they watch each other's backs.

A group of gentlemen of fortune visits a legendary "Lost City", located in Tibet. They plan to steal a priceless statue "Golden Dragon" during the martial arts tournament.