Two rivals are out to recover a cache of stolen jewels. The thief who originally stole them has just gotten out of prison, however, and he is looking for his twin brother, who knows where the jewels are hidden. Complications ensue.
| Actor | Role |
|---|---|
 Tony KendallJo Louis Walker / 'Kommissar X' | Jo Louis Walker / 'Kommissar X' |
 Brad HarrisCapt. Tom Rowland | Capt. Tom Rowland |
 Corny CollinsEmily Lambert | Emily Lambert |
| HHannelore KrammBetty Rogers | Betty Rogers |
 Siegfried RauchAnthony | Anthony |
 Franco FantasiaRobert Hillary / Arthur Hillary | Robert Hillary / Arthur Hillary |
 Erwin StrahlInsp. Lefevre | Insp. Lefevre |
 Gianfranco ParoliniSmoky | Smoky |
 Erika BlancElizabeth Hillary | Elizabeth Hillary |
| LLaci von RonayInspektor Barry | Inspektor Barry |
| CCarlos de CastroWilliam Rogers | William Rogers |