A good doctor is out to stop his evil doctor brother from blackmailing his patients.
| Actor | Role |
|---|---|
 Curd JürgensDr. Jan Diffring | Dr. Jan Diffring |
 Christiane RückerMargot Rau | Margot Rau |
 Heinz ReinckeWilli Nippens | Willi Nippens |
 Marianne HoffmannKarin Steffen | Karin Steffen |
 Fritz WepperHein Jungermann | Hein Jungermann |
| MMonika ZinnenbergGerda Heske | Gerda Heske |
 Friedrich SchütterSiegfried Gersum | Siegfried Gersum |
 Suzanne RoquetteElisabeth Langhoff | Elisabeth Langhoff |
| MMichael ContiHelmut Weiher | Helmut Weiher |
| AAstrid FournellBärbel Harms | Bärbel Harms |
| HHans W. HamacherKriminalrat Janson | Kriminalrat Janson |
 Dieter BorschePfarrer Feddersen | Pfarrer Feddersen |
 Rolf OlsenLeichenbeschauer | Leichenbeschauer |
 Horst NaumannDr. Klaus Diffring | Dr. Klaus Diffring |
 Claus TinneyPartyguest | Partyguest |
 Karin SchubertAktmodell | Aktmodell |
| RRenate SchubertKäthe Braun | Käthe Braun |
| CCarlo LiebmannLutz | Lutz |