The plot centers on Sidney Toler’s portrayal of “Charlie,” accompanied by his son "Tommy" (Benson Fong) and chauffeur "Birmingham Brown" (Mantan Moreland), as they look into a bank-related murder involving three people. A peculiar element arises from the use of cobra venom in the killings, which brings back memories for the detective of an earlier case he handled in Shanghai. The individual responsible for that prior…