Acting Lieutenant Hornblower and his crew are captured by the enemy while escorting a Duchess who has secrets of her own.
Unfortunately the movie Hornblower: The Duchess and the Devil is not yet available on HBO Max.
| Writing | Patrick Harbinson | Writer |
| Writing | C. S. Forester | Author |
| Directing | Andrew Grieve | Director |
| Editing | Keith Palmer | Editor |
| Sound | John E. Keane | Original Music Composer |
| Production | Vernon Lawrence | Executive Producer |
| Art | Cathy Cosgrove | Property Buyer |
| Art | Dave Channon | Construction Manager |
| Production | Adele Steward | Production Coordinator |
| Production | Peter Richardson | Line Producer |
| Visual Effects | Graham Aikman | Pyrotechnic Supervisor |
| Production | Nigel Gostelow | Location Manager |
| Art | Rob Harris | Production Design |
| Sound | Colin Codner | Boom Operator |
| Editing | Matthew Tucker | Assistant Editor |
| Directing | Amanda Lean | Script Supervisor |
| Directing | David Mason | First Assistant Director |
| Lighting | Tom Gates | Gaffer |
| Costume & Make-Up | John Mollo | Costume Design |
| Directing | Alex Gibb | Third Assistant Director |
| Production | Andrew Benson | Producer |
| Camera | Alec Curtis | Director of Photography |
| Directing | Giles Butler | Second Assistant Director |
| Production | Pauline Granby | Production Accountant |
| Production | Delia Fine | Executive Producer |
| Costume & Make-Up | Gordon Harmer | Wardrobe Supervisor |
| Crew | Jon Baker | Armorer |
