A millionaire residing in an old castle in Norfolk is forced to pay over large sums of money to an unknown gang of racketeers and secretly he calls to his assistance some of the greatest detectives and the most notorious criminals in the world. We meet the incomparable Gilbert Larose, the mighty Naughton Jones, Hidou the sewer-rat of Paris, and Raphael Croupin the merry international thief, and many others.