Phantom of Chinatown

From IMDb: Detective James Lee Wong is on the scene as archeologist Dr. John Benton, recently returned from an expedition in China where a valuable ancient scroll was recovered, is murdered while giving a lecture on the expedition. Stars: Keye Luke, Grant Withers and Lotus Long This movie can also be found at The Internet Archive here and here. The Mr. Wong series of films Mr. Wong, Detective The Mystery of Mr. Wong Mr. Wong in Chinatown The Fatal Hour Doomed to Die Phantom of Chinatown