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.
| Camera | Robert Krasker | Director of Photography |
| Editing | Thelma Myers | Editor |
| Art | Wilfred Shingleton | Art Direction |
| Production | Leslie Gilliat | Production Manager |
| Directing | Guy Hamilton | Assistant Director |
| Costume & Make-Up | Michael Morris | Makeup Artist |
| Sound | Lee Doig | Sound Editor |
| Directing | Paddy Arnold | Continuity |
| Writing | Roy Huggins | Novel |
| Production | Frank Launder | Producer |
| Directing | Sidney Gilliat | Director |
| Production | Sidney Gilliat | Producer |
| Camera | Edward Scaife | Camera Operator |
| Writing | Sidney Gilliat | Screenplay |
| Sound | William Alwyn | Original Music Composer |
| Costume & Make-Up | Ivy Baker | Costume Design |
| Costume & Make-Up | Beatrice Dawson | Costume Design |
| Costume & Make-Up | Waleen Whitworth | Hairdresser |
| Art | John Hawkesworth | Assistant Art Director |
| Art | Kenneth McCallum Tait | Assistant Art Director |
| Sound | Alan Allen | Sound Recordist |
| Camera | Gerry Fisher | Assistant Camera |
| Editing | Derek Armstrong | Assistant Editor |
| Sound | Muir Mathieson | Conductor |
| Production | Cyril Coke | Producer's Assistant |
