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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.

• Director: Scott Sidney
• Cast: Wedgwood Nowell, Ralph Lewis, Wallace Beery, J.P. Lockney, William V. Mong, Colin Kenny, Milton Ross, Thornton Edwards