813 (1920)

"In her distress she appealed to the chief of police. He promised aid, but did not know that she ???"

Robert Castleback is in possession of secret papers which could bring a certain prince to power under conditions which would make Castleback a ruling force in Europe. Master crook Arsene Lupin becomes aware of Castleback's bid for power and, in the interests of France, begins a search for the plans.