Directed by Francis Searle and produced by Hammer Film Productions, Cloudburst is a taut British post-war crime thriller that blends espionage, grief, and moral ambiguity. Based on a story by Leo Marks—a real-life cryptographer for the Special Operations Executive during WWII—the film stars Robert Preston as a haunted veteran whose skills in code-breaking become tools of revenge.
Plot Summary
John Graham (Robert Preston), a Canadian WWII veteran working for the British Foreign Office, is shattered when his pregnant wife Carol (Elizabeth Sellars) is killed in a hit-and-run accident. But this is no random tragedy—the driver was fleeing the scene of a murder. As Graham uncovers the truth, he uses his wartime cryptographic expertise to track down the killers, navigating a web of lies, underworld contacts, and moral compromise.
What begins as a procedural slowly morphs into a revenge noir, with Graham descending into obsession. His transformation from civil servant to vigilante is chillingly methodical, and the film’s final act questions whether justice and vengeance can ever truly align.
Cast Highlights
- Robert Preston as John Graham
- Elizabeth Sellars as Carol Graham
- Colin Tapley as Inspector Davis
- Sheila Burrell as Lorna Dawson
- Harold Lang as Mickie Fraser / Kid Python
- Mary Germaine, Stanley Baker, and Edith Sharpe in supporting roles
Behind the Scenes Trivia
- Leo Marks, who wrote the original story, was responsible for crafting secret codes for Allied agents during WWII. His experience lends the film a rare authenticity in its depiction of cryptographic work.
- Marks later became known for writing Peeping Tom (1960), another psychologically intense thriller.
- Robert Preston, best known for The Music Man, delivers a restrained but intense performance—his character’s emotional unraveling is one of the film’s strongest elements.
- The film was shot in London, using real locations to heighten its post-war realism.
- Though produced by Hammer Films, Cloudburst predates their horror era and belongs to their early crime drama catalog.
- The UK version runs 92 minutes, while the U.S. release was trimmed to 83 minutes, losing some of the slower, character-driven scenes.
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