Biography and apology of the famous pilot, nicknamed by some the Archangel, who organized the airmail network of South America, flew the first over the Andes Cordillera, maintained the mystique of the South Atlantic, militated in the Crosses of Fire and perished at the controls of "La Croix du Sud" during its twenty-fourth crossing.

Claude, who temporarily replaces his father at the head of a department store, falls in love at first sight with a pretty female customer. He finds out that she is named Solange and that she is the goddaughter of Professor Hauteclerc, who runs a private psychiatric hospital. To come closer to the girl of his dreams, Claude has a crazy idea: he pretends to be mad so as to be placed in Hauteclerc's institution.