An old man about to die gives all his fortune to a young beggar he meets in an Arabian town. He takes him to his house (now the poor man's property) and he strongly advises him not to open one of the doors, the seventh door. "I could throw the key into the sea" says the young lad" No use, you'd dive to get it back". The young man is curious and he cannot resist temptation: he opens the forbidden door. A strange world is waiting for him where a girl, Leila, will be his guide .

Laurangeais stays in a nursing home after his wife dies following an accident caused by Terrian, his adopted son. When he leaves he finds Terrian who is going to get married. He drags his future wife into a cabin and kills her.

Although they have loved each other since childhood without admitting it, a surgeon and a young woman see their love thwarted by life.

During the Tour de France, five riders are found murdered with a red tulip near their bodies. A journalist and a police inspector lead the investigation to unmask the murderer.

While investigating the world of Parisian tramps, journalist René Savary, himself disguised as a poor beggar, notices the strange behavior of a little boy. He follows the brat after he has sneaked out of a barge, catches up with him and takes him to his home. There, the kid tells him about himself : his name is Jean, his mother has disappeared and since then he has been left to fend for himself. Moved by the lot of the wretched boy, Savary, with the aid of his friend Pierrot, undertakes to solve the mystery.

Maxime Bellac owns an art gallery. He has an affair with Michelle. One night when they have dinner together, Maxime tells Michelle he is forced to leave for the Canaries because of paintings. When they take a walk after their meal,a man suddenly appears, revolver in hand. In self-defense, Maxime kills him and,much to his surprise, recognizes a national security agent.Maxime confesses that he is in the pay of an eastern power; his mission is to get a file concerning Western nuclear weapons. Because of his crime, he cannot carry out his job; for Maxime's love, Michelle takes his place and becomes a spy.

The inhabitants of a small provincial town are requisitioned to take part in the French army's major maneuvers. A foreign spy takes advantage of these maneuvers to steal secret documents. The pursuit and capture of the spy and his accomplices are successfully carried out by all those taking part in the maneuvers.

A Dakota plane is carrying a ton of gold bound for Brazzaville, but it is hijacked over the Camargue. On arrival, we find nails instead of gold!