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.
| Actor | Role |
|---|---|
 Wedgwood NowellArsene Lupin | Arsene Lupin |
 Ralph LewisRobert Castleback | Robert Castleback |
 Wallace BeeryMaj. Parbury / Ribeira | Maj. Parbury / Ribeira |
 J.P. LockneyFormerie | Formerie |
 William V. MongChapman | Chapman |
 Colin KennyGerard Beaupre | Gerard Beaupre |
| MMilton RossGourel | Gourel |
| TThornton EdwardsDoudeville | Doudeville |
 Frederick VroomPrefect of Police | Prefect of Police |
| MMark FentonMarco | Marco |
 Kathryn AdamsDolores Castleback | Dolores Castleback |
 Laura La PlanteGenevieve | Genevieve |
 Vera SteadmanVashti Seminoff | Vashti Seminoff |