Rouletabille's fiancée, a young journalist always on the lookout for an investigation to solve, tells him how she has just suppressed a spy. Marriage is in question...
| Actor | Role |
|---|---|
 Marie DéaWanda | Wanda |
| SSuzanne DehellyFlorine | Florine |
 Jean PiatJoseph Rouletabille | Joseph Rouletabille |
| FFernand GilbertNot listed | Not listed |
 Jérôme GoulvenNot listed | Not listed |
 Lucas GridouxNot listed | Not listed |
 Andrée GuizeNot listed | Not listed |
 Léo LaparaNot listed | Not listed |
| YYette LucasNot listed | Not listed |
| AAriane MuratorNot listed | Not listed |
 Monique MélinandNot listed | Not listed |
 Claude NicotNot listed | Not listed |
 Michel VitoldNot listed | Not listed |