In order to infiltrate a gang of assassins, Mr Moto (Peter Lorre) has himself incarcerated on Devil's Island. There he helps Paul (Leon Ames) to escape.
Now in his confidence, Mr Moto travels with Paul to London to be his Japanese valet. Moto discovers a plot to kill the industrialist Anton Darvak (Henry Wilcoxon), however he doesn't know who the leader of the gang is and begins an investigation in the seedy side of London and also fine art...
This is an excellent instalment in the Mr Moto series with the Japanese detective having to employ his skills in disguise as well as fighting. The "English" accents are hilariously bad. The reveal of the evil mastermind is good, though probably predictable.
