This is the fifth installment of this mystery series created by Pulitzer Prize-winning novelist J.P. Marquard. Considered by some as the poor man's Charlie Chan, but still interesting and enjoyable. The mild mannered Mr. Moto(Peter Lorre)agrees to help Scotland Yard by using a Devil's Island inmate's disguise to track down a gang of ruthless assassins. Moto must help his cell mate(Leon Ames)escape in order to get the low down on his unlawful friends. The Japanese sleuth always seems to complete his assignments relying on his wits and martial arts skills. Players include: Mary Maguire, Harold Huber, John Roberts and Henry Wilcoxon.