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
as Charlie Chan
Mantan Moreland
as Birmingham Brown
Edwin Luke
as Eddie Chan
Hardie Albright
as Walter Meeker
Janet Warren
as Jean Kent
Al Bridge
as Sheriff Mack
Edith Evanson
as Louise Harper
Dorothy Granger
as Stella Graham
Cyril Delevanti
as Roth
Jack Ingram
as Lloyd Archer
Lester Dorr
as Michael Strong
Frank Reicher
as Harper
