Charlie Chan is in Shanghai this time. Strange that the Chinese detective has never been set there before, but that oversight is patched up very nicely in this film. It’s right in line with the eight previous Chan pictures.Warner Oland, the merry Swede who has won himself an international rep as a Chinaman, still handles the Chan assignment with competence and ease. This time he’s after a gang of dope smugglers in China. Keye Luke is cast as his son and gets in some nice laughs.