Slim Callaghan investigates the theft of the famous Upper Sangha diamonds. Disguised as a Salvation Army auxiliary, he boards a luxury yacht where a transvestite party is being held. During an illusionist's trick, Callaghan manages to steal the precious diamonds, but the thief escapes.
| Actor | Role |
|---|---|
 Tony WrightSlim Callaghan | Slim Callaghan |
 Geneviève KervineCarola | Carola |
 André LuguetNeck | Neck |
 Fabienne DaliMaguy | Maguy |
 Nicolas VogelMorand | Morand |
| YYvette MaurechNot listed | Not listed |
 Philippe GuéganNot listed | Not listed |
| EEmile MarinNot listed | Not listed |
| WWilly ReyNot listed | Not listed |
| JJ. MoreauNot listed | Not listed |
| JJean FrancelNot listed | Not listed |
 Joëlle BernardNot listed | Not listed |
 Jean LaraNot listed | Not listed |
| RRobert BerriNot listed | Not listed |
 Jean Combal(uncredited) | (uncredited) |
 Jean-Pierre Zola(uncredited) | (uncredited) |