Crime writer Andrew Dax and his gorgeous wife Kate go on holiday to a country cottage, where they receive an unexpected visitor, the bossy Miss Tulip, who needs shelter for the night. In the morning, there's a dead body in the house.

While filling in for injured supersleuth Bulldog Drummond (Atholl Fleming), world-class cricket player Jack Pennington (Jack Hulbert) attempts to foil a criminal mastermind's (Ralph Richardson) impending heist that's targeting a valuable jewel necklace held within the British Museum. This comedic 1930s mystery features daring rescues, intense fistfights and an exciting edge-of-your seat finale aboard a runaway train.