Terwijl de Amerikaanse hartchirurg dr. John Marlowe op bezoek is in Engeland, wordt hem gevraagd generaal Niva, de dictator van de Balkanstaat Vosnia, te opereren. Wanneer Niva alsnog overlijdt, wil kolonel Galcon, het hoofd van de Geheime Dienst, dat Marlowe Niva’s taak overneemt. De bevolking mag niet weten, dat de Niva dood is. Daarnaast is Marlowe een risicofactor: hij weet te veel. De wanhopige Marlowe weet te vluchten en onderweg krijgt hij hulp van de Engels sprekende actrice Lisa Robinson. Maar de Geheime Dienst zit beiden op de hielen.
Nee, helaas is State Secret nog niet beschikbaar op Netflix in Nederland.
| Costume & Make-Up | Michael Morris | Makeup Artist |
| Directing | Paddy Arnold | Continuity |
| Art | Wilfred Shingleton | Art Direction |
| Production | Leslie Gilliat | Production Manager |
| Camera | Robert Krasker | Director of Photography |
| Sound | Lee Doig | Sound Editor |
| Production | Frank Launder | Producer |
| Directing | Guy Hamilton | Assistant Director |
| Writing | Roy Huggins | Novel |
| Editing | Thelma Myers | Editor |
| Directing | Sidney Gilliat | Director |
| Production | Sidney Gilliat | Producer |
| Camera | Edward Scaife | Camera Operator |
| Writing | Sidney Gilliat | Screenplay |
| Costume & Make-Up | Beatrice Dawson | Costume Design |
| Sound | William Alwyn | Original Music Composer |
| Sound | Alan Allen | Sound Recordist |
| Costume & Make-Up | Ivy Baker | Costume Design |
| Art | Kenneth McCallum Tait | Assistant Art Director |
| Camera | Gerry Fisher | Assistant Camera |
| Costume & Make-Up | Waleen Whitworth | Hairdresser |
| Art | John Hawkesworth | Assistant Art Director |
| Sound | Muir Mathieson | Conductor |
| Production | Cyril Coke | Producer's Assistant |
| Editing | Derek Armstrong | Assistant Editor |
