When millionaire "Manning" (Sam Flint) is found dead inside a locked room, the baffled police make no progress so pretty much abandon their efforts to apprehend the culprit. A while later, the victim's daughter "Leah" (Joan Woodbury) finds the case the subject of a book that levels some pretty unsavoury accusations, and so she enlists the talents of the sleuthing "Charlie Chan" (Sidney Toler) to get to the bottom of…