Mr. Moto's Gamble (1938)

Mr. Moto's Gamble is the third film in the Mr. Moto series starring Peter Lorre as the title character. It was released in 1938. It was originally intended to be a Charlie Chan film called Charlie Chan at Ringside, but Warner Oland, who had played Chan in several previous films, left the set after a few days of filming due to illness. The script was rewritten as a Mr. Moto movie, featuring Keye Luke as Lee Chan (in his only appearance in the Mr. Moto series) as Mr. Moto's student in his criminology class at San Francisco University. Mr Moto mentions that he has heard from Chan's father in Honolulu, where Charlie Chan was. Mr Moto says he and Riggs (who is head of the Homicide Squad) are but floundering amateurs compared to Chan's father.