To protect him, Georges takes the place of his twin brother, Jacques, suspected of murdering an aircraft manufacturer and stealing the plans for a revolutionary engine. He sets out to compromise the police investigation and the actions of the document smugglers seeking to recover the plans.
| Actor | Role |
|---|---|
 Louis VelleJacques Pile / Georges Pile | Jacques Pile / Georges Pile |
 Nicole CourcelHélène Davault | Hélène Davault |
 Paul MeurisseInspector Morice | Inspector Morice |
 Jean TissierJules, manservant | Jules, manservant |
 Bernard DhéranBarat | Barat |
 Jane MarkenNène Thierry | Nène Thierry |
 Albert DinanRaty | Raty |
 Georges DemasVictor | Victor |
 Jackie BlanchotRey | Rey |
 Jack AryGangster | Gangster |
| LLucien AnquetilNot listed | Not listed |
| HHenri RiouNot listed | Not listed |
 Georges BeverNot listed | Not listed |
 Jean DaurandGangster | Gangster |
 Gloria FranceNot listed | Not listed |
 Roland ToutainGil Fokkerman | Gil Fokkerman |