The food magazine editor Charles Duchemin (Louis de Funès) possesses a gifted sense of smell and taste, allowing him to determine if the food is as delicious as the legends claim merely by smelling it through his nose and tasting it with his mouth. To let his readers experience truly delicious food, he often disguises himself to infiltrate various restaurants and hotels to taste their offerings. If the food is good, he will highly recommend it in his magazine; if it is bad, he will not hesitate to criticize it. Thus, he has become the devil in the eyes of restaurant and hotel owners, yet a god in the hearts of readers. Due to his advanced age, Charles Duchemin hopes that his son Gérard Duchemin (Coluche), who also has a superhuman talent for smell and taste, will inherit his legacy. Unfortunately, Gérard is only interested in the circus and often sneaks off to be a clown, leading to a series of humorous mishaps. However, a fast-food tycoon who dreams of dominating the French restaurant industry ultimately brings the father and son together.