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.
Charlie Chan
Birmingham Brown
Eddie Chan
Walter Meeker
Jean Kent
Sheriff Mack
Louise Harper
Stella Graham
Roth
Lloyd Archer
Michael Strong
Harper
Inspector Godfrey
Dr. Samuel R. Peabody
Bellboy
Officer Jim Kimball
Police Officer (uncredited)
