Unnatural Causes(1993)

Unnatural Causes is a British detective film featuring Roy Marsden as P.D. James's Inspector Adam Dalgliesh. When the body of a celebrated mystery writer surfaces in a dinghy off the Suffolk coast, Dalgliesh takes charge of the investigation. The case grows complicated when he's forced to work alongside the aptly named Inspector Reckless, whose methods clash with his own methodical approach. As Dalgliesh unravels the circumstances surrounding the writer's death, he must navigate both the crime itself and the friction with his difficult colleague. The film balances procedural mystery with character tension, grounding the investigation in the atmospheric coastal setting of East Anglia.