Andrew Manson, a young, idealistic, newly qualified Scottish doctor arrives in Wales takes his first job in a mining town, and begins to wonder at the persistent cough many of the miners have. When his attempts to prove its cause are thwarted, he moves to London. His new practice does badly. But when a friend shows him how to make a lucrative practice from rich hypochondriacs, it will take a great shock to show him what the truth of being a doctor really is.
Unfortunately the movie The Citadel is not yet available on Disney Plus.
| Directing | King Vidor | Director |
| Writing | Frank Wead | Screenplay |
| Writing | Ian Dalrymple | Screenplay |
| Crew | Charles Williams | Additional Music |
| Sound | John Aldred | Sound Assistant |
| Crew | Emlyn Williams | Additional Dialogue |
| Writing | Elizabeth Hill | Screenplay |
| Camera | Gerry Massy-Collier | Assistant Camera |
| Camera | Peter Hopkinson | Assistant Camera |
| Sound | Cecil Milner | Orchestrator |
| Sound | A.W. Watkins | Sound Recordist |
| Crew | Howard Dietz | Public Relations |
| Sound | C.C. Stevens | Sound Recordist |
| Writing | A.J. Cronin | Novel |
| Camera | Harry Stradling Sr. | Director of Photography |
| Sound | Louis Levy | Original Music Composer |
| Editing | Charles Frend | Editor |
| Art | Lazare Meerson | Art Direction |
| Directing | Pen Tennyson | Assistant Director |
| Art | Alfred Junge | Art Direction |
| Production | Victor Saville | Producer |
| Production | Hayes Goetz | Executive Producer |
| Production | Harold Boxall | Production Manager |