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.

A spoiled heiress defies her millionaire father by running off to France to pursue her lover. Things don't go entirely as planned.