After a time of suspended activities, Zigomar attempted to rob the biggest bank in Paris; but in this he was frustrated by the detective. Swearing vengeance he tried to wreck the train upon which the detective was traveling, but one of the detective’s spies got wind of it and warned him. Ascertaining that the detective was to make his journey by motorboat instead of by rail, Zigomar and La Rosario, at the point of revolvers, forced an aviator to carry them high up in the air, and, when directly above the motorboat, Zigomar dropped several explosive bombs upon the frail craft, blowing it into pieces and injuring the detective so seriously that he was placed in a hospital. When he was convalescent, Broquet received a letter of invitation from the banker, whom he had warned against the diabolical machinations of Zigomar, to come to his house and see how he entertained his guests. While there, the banker showed Broquet how he, by an ingenious arrangement of mirrors, was able to see the strong room of the bank. While they were looking Zlgomiir and his band broke into the strong room and began to loot the safes. By pressing a button, the strong room was soon flooded and the bandits captured.