German actor Peter van Eyck stars as Droste, a mild-mannered businessman who was an intelligence expert during World War II. When Droste runs into his old friend Baron Von Straub (Christopher Lee), the two rekindle a friendship that was interrupted by the war. However, when Von Straub asks Droste to deliver a small package to a friend in West Germany, the befuddled Droste is set up for a series of complicated spy games.
| Sound | Philip Green | Music |
| Production | Artur Brauner | Executive Producer |
| Writing | Robert Westerby | Screenplay |
| Directing | John Paddy Carstairs | Director |
| Editing | Tom Simpson | Editor |
| Writing | Hans Habe | Novel |
| Crew | Gerald Gibbs | Cinematography |
| Production | Emmett Dalton | Producer |