Police in Paris recruit an English ship's officer (Michael Craig) to help trap counterfeiters by joining them.
| Actor | Role |
|---|---|
 Michael CraigLarry Ellis / Steve Chancellor (dec.) | Larry Ellis / Steve Chancellor (dec.) |
 Julia ArnallDiane Gilbert | Diane Gilbert |
 Brenda De BanzieMme. Isabella Ballu | Mme. Isabella Ballu |
 Barbara BatesJudy Anderson | Judy Anderson |
 David KossoffHenryk van de Heide, CIA | Henryk van de Heide, CIA |
| GGérard OuryJulius Pindar | Julius Pindar |
 Geoffrey KeenCol. Burleigh, CIA | Col. Burleigh, CIA |
 Anton DiffringAnton Lauderbach | Anton Lauderbach |
 Eric PohlmannGratz | Gratz |
 Eugene DeckersVidal | Vidal |
 Jacques BruniusLessage | Lessage |
 Carl JaffeWalter Dorffman | Walter Dorffman |
| GGordon TannerCurtice | Curtice |
 Alan TilvernBrandelli | Brandelli |
 BalbinaLauderbach's Maid | Lauderbach's Maid |
| DDavid LanderMarseilles Detective | Marseilles Detective |
 John SerretCommissaire | Commissaire |
| PPatrick WestwoodDufrene | Dufrene |
| YYves ChanteauMatthews | Matthews |
| JJean DriantGratz's Assistant | Gratz's Assistant |
| VViolet GouldBarmaid | Barmaid |
| DDudley MessengerShip's Captain | Ship's Captain |
| EErnie RiceBarman | Barman |
 Yvonne RomainNot listed | Not listed |