Guarda su Altadefinizione. Melodramatic war drama based on a novel by M.A. Bernière, directed by M. Pouctal, conceived as popular propaganda. When it turns out that plant director M. Dalibert has suddenly disappeared, Chantecoq is charged with the investigation. Through creative means he succeeds to unravel the case, involving two German spies looking for a secret recipe for a new French weapon of war.