Behind That Curtain (film)

Behind That Curtain is a 1929 American PreCode mystery film directed by Irving Cummings, starring Warner Baxter and featuring Boris Karloff. It was the first Charlie Chan film to be made at Fox Studios. It was based on the novel of the same name. Charlie Chan is played by Korean American actor E. L. Park, gets one mention early in the film, then makes a few momentary appearances after 75 minutes.

Source: Wikipedia