Although lacking the ingenuity of the first Mr. Wong whodunit, Mr. Wong, Detective (1938), The Mystery of Mr. Wong remains an above-average B-thriller anchored by Boris Karloff's relaxed rendering of pulp writer Hugh Wiley's Oxford-educated Chinese sleuth. Although experienced armchair detectives may not find the solution to the riddle all that taxing -- after all, how many "Dr. Watsons" does Mr. Wong really need? -- the soft-spoken investigator performs his duty with a meticulousness lacking in some of his more outrageous colleagues and plot holes are few and far between. But why the title The Mystery of Mr. Wong? Wong himself is not at all mysterious; in fact, except for no-nonsense Detective-Sergeant Street (Grant Withers), he remains the least enigmatic of all the inhabitants, permanent or otherwise, of star-crossed Brandon Edwards Mansion.