When Dr. Howard Latimer finds the German actress whom he had just met at the London Airport murdered in his flat, he is led into a world of murder, blackmail, and a fake passport scam.
| Actor | Role |
|---|---|
 John MillsDr. Howard Latimer | Dr. Howard Latimer |
 Derek FarrKenneth Palmer | Kenneth Palmer |
 Noelle MiddletonLaura James | Laura James |
 Wilfrid Hyde-WhiteMaj. Harrington aka Robert Brady | Maj. Harrington aka Robert Brady |
 Roland CulverDetective Inspector Dane | Detective Inspector Dane |
 Mervyn JohnsDr. George Kimber | Dr. George Kimber |
 Rène RayMrs. Ambler | Mrs. Ambler |
 Lionel JeffriesGeoffrey Windsor | Geoffrey Windsor |
 Lisa DanielyFrieda Veldon | Frieda Veldon |
| DDavid WilliamsThe Detective Sergeant | The Detective Sergeant |
| DDiana LambertLatimer's Office Nurse | Latimer's Office Nurse |
 Hal OsmondJoe - Golf Caddy | Joe - Golf Caddy |
| GGillian MoranNot listed | Not listed |