Paco Sanchez and Dédé Gallice have been friends since childhood. They grew up together with a passion for karate. The day comes when they must face a decisive fight. Paco refuses to compete against his best friend, so Dédé wins the title of “Champion of Seine Saint-Denis” by default. Three years later, Dédé is wrongly accused of stealing by the owner of the nightclub where he is working and, with the help of his wife, Claire, goes on the run. The paths of the two friends cross once again. But whereas Dédé has never got over his undistinguished victory and has withdrawn into his own bitterness, Pablo, enriched by a long journey through the martial arts, has opened himself up to the world. Pursued by his boss with his staff in toe, Dédé, in spite of himself, drags Claire and Pablo along with him on a frantic night flight, punctuated by spectacular fight sequences.