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River Patrol is a 1948 British second feature ('B') crime film directed by Ben R. Hart and starring John Blythe, Lorna Dean, and Wally Patch. The screenplay was likely written by the film's editor James Corbett, but there is no writer's credit listed. The film concerns a group of undercover British customs officers who investigate a gang of smugglers. It was made by Hammer Film Productions at Marylebone Studios in London. It is notable for being one of the earliest films made by Hammer following its relaunch after the Second World War. It is today considered a lost film