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After Detective Bulldog Drummond (Atholl Fleming) is injured in a car accident, he asks Jack Pennington (Jack Hulbert) to masquerade as him after Ann Manders (Fay Wray) asks for his help in finding her grandfather. Pennington agrees, and enlists the help of Algy Longworth (Claude Hulbert). Ann’s grandfather, a renowned jeweller, has been kidnapped by arch criminal Morelle (Ralph Richardson) who needs him to make a duplicate of a priceless necklace housed in the London Museum. The idea is to swap the necklace, but the plan goes wrong and the crooks soon find themselves being chased on a runaway train.