Shadow of Chinatown

This 1936 film is feasture-length version of a 15-part serial. It stars Bela Lugosi five years after his success in Dracula, and many years before he fell in with Ed Wood's gang.
A beautiful Eurasian girl and a mad scientist (that would be Lugosi) have been hired by a European import firm to destroy a group of Chinese merchants so they can take over their business. A scrappy newspaper reporter and her hunk boyfriend decide to investigate.
It's a bit of a light-hearted lark, and horribily over-acted in parts, but some of the action scenes are ingenious and well-done. Bela barely appears in the movie at all, probably a smart move.