Myrna Loy, best known as Nora Charles in the "Thin Man" series, gives Boris Karloff a run for his money in "The Mask of Fu Manchu." Sax Rohmer's well educated (degrees in philosophy, medicine, and, hmm...music?... law?) master of evil hasn't had too many high class, well-crafted films devoted to his exploits, and this M-G-M effort has more class than craft, but Miss Loy's appearance as Manchu's daughter enlivens the otherwise dreary 67 minutes. Karloff, fresh from his star making role in "Frankenstein," is tame in comparison.