In the Secret Service: Charlie Chan is an agent of the U.S. government assigned to investigate the mysterious death of an inventor.
The Chinese Cat: Chan (Sidney Toler) and Number Three Son (Benson Fong) are chased through a veritable labyrinth of fun house tricks after coming to the aid of a damsel in distress (Joan Woodbury).
The Jade Mask: Charlie Chan (Sidney Toler), his pseudo-intellectual Number Four Son (Edwin Luke) and panicky partner (Mantan Moreland) find themselves at odds with an entire family while investigating a brilliant scientist's murder.
The Scarlet Clue: Sidney Toler is back as the inscrutable Charlie Chan who takes on a group of fast-track media types in this '40s sendup of bad radio drama, snarling sponsors and tense thespians.
The Shanghai Cobra: In his screen debut, the incomparable Charlie Chan calls in his Number Four Son (Benson Fong) and loyal assistant (Mantan Moreland), to help investigate a series of murders committed with cobra venom.