Following in the inscrutable footsteps of Charlie Chan and Mr. Moto, Boris Karloff portrayed Chinese-born crimefighter Mr. Wong in a series of classic "whodunits." Here, the murder of a chemical manufacturer kicks off an investigation that puts Wong up against sinister foreign agents who are after the formula for a deadly poison gas. With Grant Withers, John Hamilton. 70 min. Standard; Soundtrack: English. Plays All Regions.