The Fatal Hour was the fourth entry in Monogram's "Mr. Wong" series, based on the gentlemanly oriental detective created by Hugh Wiley. Boris Karloff returns as Wong, supported by Grant Withers as dyspeptic police captain Street and Marjorie Reynolds as brash gal reporter Bobbie Logan. On this occasion, Mr. Wong investigates the murder of a police officer, nearly ending up murdered himself during a climactic jewelry-store robbery. The principal suspect is Belden (Craig Reynolds), the son of a crooked businessman (John Hamilton) whose perfidy has apparently caused all the trouble in the first place. The Fatal Hour was scripted by Joseph West, a pseudonym for director George Waggner (who didn't direct this one).