Naples of the early twentieth century. A thug keeps a girl completely submissive and, having discovered that she is the daughter of a nobleman, tries to blackmail the father.
After the discovery of two murders, Commissioner Chabrier, of the French secret services, is investigating the disappearance of plans affecting the national defense of the country robbed by a gang of international spies.
Slip and Sach are working for a local newspaper as a reporter and photographer, respectively. Slip wants to get the goods on a local gambling ring that is fixing sporting events, so he and Sach go undercover to expose the ring.
Maggi continues her forever-ever efforts to crash Manhattan's top society, while Jiggs still mingles with his old construction cronies at the bar of Dinty Moore on 10th Avenue.
The owner of a cosmetics factory has made a contract with Radio Sibilla for the transmission of an evening program in which the products of his company are advertised.