Former East German engineer Erich Becker had been lured to West Germany by promises of a high reward. Now residing in Stockholm, he is recalled to serve as a spy in the East. He is to convince Dr. Jadenburg to flee from the GDR with the help of his daughter Hanna, who works for the West. While travelling on the train with Hanna, he is told that he is also to murder another agent who betrayed and now works for the Stasi. The traitor is revealed to be a former friend of Becker, Harry Korb.
| Actor | Role |
|---|---|
 Hans-Peter MinettiErich Becker | Erich Becker |
 Peter HerdenHarry Korb | Harry Korb |
 Irma MünchHanna Melvien | Hanna Melvien |
 Martin FlörchingerDr. Jadenburg | Dr. Jadenburg |
 Herbert KöferCellist | Cellist |
 Ingeborg Krabbejunge Ehefrau | junge Ehefrau |
 Hannjo HasseHauptmann Donath | Hauptmann Donath |
 Peter SturmZugschaffner | Zugschaffner |
 Hubert HoelzkeNot listed | Not listed |
| HHeinz HinzeCharles Renier | Charles Renier |
 Horst SchönemannStein | Stein |
 Hans KleringBlaßblonder | Blaßblonder |
 Werner LierckEhemann | Ehemann |
 Gertrud BrendlerFrau Simmel | Frau Simmel |
 Klaus GendriesLeutnant der Grenzpolizei | Leutnant der Grenzpolizei |
 Harry StudtGrott | Grott |
| SSiegfried NürnbergerMitarbeiter von Donath | Mitarbeiter von Donath |