De zoon van een Britse agent wordt ontvoerd en vastgehouden voor losgeld in diamanten. De agent komt erachter dat hij niet eens kan rekenen op de mensen waarvan hij dacht dat ze aan zijn kant stonden om hem te helpen, dus besluit hij zelf de ontvoerders op te sporen.
Nee, helaas is The Black Windmill nog niet beschikbaar op Netflix in Nederland.
| Directing | Don Siegel | Director |
| Writing | Clive Egleton | Novel |
| Editing | Antony Gibbs | Editor |
| Art | Peter Murton | Art Direction |
| Costume & Make-Up | Anthony Mendleson | Costume Design |
| Costume & Make-Up | Freddie Williamson | Makeup Artist |
| Production | Eva Monley | Production Manager |
| Camera | Ousama Rawi | Director of Photography |
| Writing | Leigh Vance | Screenplay |
| Production | Richard D. Zanuck | Executive Producer |
| Production | Don Siegel | Producer |
| Production | Scott Hale | Associate Producer |
| Production | David Brown | Executive Producer |
| Sound | Roy Budd | Original Music Composer |
| Directing | Kip Gowans | Assistant Director |
| Sound | Gerry Humphreys | Sound Recordist |
| Sound | John W. Mitchell | Sound Recordist |
| Sound | Les Wiggins | Sound Editor |
| Directing | Angela Allen | Continuity |
| Costume & Make-Up | Rosemary Burrows | Wardrobe Supervisor |
| Camera | James Devis | Camera Operator |
| Lighting | Nobby Cross | Gaffer |
| Camera | Colin Davidson | Clapper Loader |
| Camera | Dewi Humphreys | Focus Puller |
