The latest assignment for respected detective Charlie Chan has come directly from the government and involves the disappearance of a scientist named Harper, who was working on an extremely important serum. When the scientist is killed, Chan must sort through all very likely suspects, including the man's sister and his butler.
Sidney Toler
Charlie Chan
Mantan Moreland
Birmingham Brown
Edwin Luke
Eddie Chan
Hardie Albright
Walter Meeker
Janet Warren
Jean Kent
Al Bridge
Sheriff Mack
Edith Evanson
Louise Harper
Dorothy Granger
Stella Graham
