Besides Sidney Toler as Charlie Chan, this film's cast contained three other actors who also played famous crimefighters: Ricardo Cortez (Sam Spade in the 1931 "Maltese Falcon"), Morgan Conway (Dick Tracy in two RKO films in the mid-1940's) and Robert Lowery (Batman in the Columbia serial "The Adventures of Batman and Robin" in 1948).
The twenty-first of forty-seven Charlie Chan movies.