There is a sameness about the Mr Moto pictures, yet the plot of each new story surrounding the detective’s adventures are always intriguing, and the action is usually carried out in such a manner as to be exciting, suspenseful and melodramatic. This one is also well bolstered by comedy relief, with Warren Hymer, a wrestler, becoming a self-appointed assistant to Lorre. His assignment to get laughs has been expertly planned and Hymer carries it out for maximum results.
Locale this time [in the seventh of the series] is Puerto Rico, where unknowns are suspected of engaging in diamond smuggling. Guilt, as usual, points in many directions and, as usual, is too often suggested by various characters who, if natural, wouldn’t be arousing so much police concern. The girl is Amanda Duff, a very attractive type, who has comparatively little to do in a romance with a very youngish officer (Robert Lowery).
Lorre is again the suave, calmly-calculating Sherlock Holmes, whose size belies his ability to overcome aggressors having twice his apparent stamina. A capable cast of seasoned players surround him, including Jean Hersholt (doing what sounds a bit like a German accent).