The daughter of a foreign diplomat in Paris is courted by two men. One of them entrusts her with a harmless commission for Poland, as she has a diplomatic passport. But it's a trap, and the girl is forced to work for Eastern spies.
| Actor | Role |
|---|---|
 Roger HaninMirmont | Mirmont |
 Christiane MinazzoliEva Dolbry | Eva Dolbry |
| LLucien NatProfessor Wilkowski | Professor Wilkowski |
 René DaryHead of the D.S.T. | Head of the D.S.T. |
 Antonio PassaliaSerge Alerio | Serge Alerio |
 René BlancardRaddel | Raddel |
 Yves BarsacqLaboratory assistant | Laboratory assistant |
 Donald O'BrienDolbry | Dolbry |
| MMadeleine LambertThe aunt | The aunt |
| LLaurence AubrayNot listed | Not listed |
 Denise BatailleNot listed | Not listed |
 Henri CoutetNot listed | Not listed |
 Robert FavartNot listed | Not listed |
 Lucien FrégisNot listed | Not listed |
 Clément HarariNot listed | Not listed |
| CClaude JennerNot listed | Not listed |
 Antoine MarinNot listed | Not listed |
 Charles MillotNot listed | Not listed |
| JJacqueline RivièreNot listed | Not listed |
 Michel SalinaNot listed | Not listed |