Charlie Chan In The Secret Service.
The World War II years, filled with espionage and spies of all sorts, were perfect for the foibles of Charlie Chan (Sidney Toler). And in this 1944 venture, America's Number One Chinese detective is enlisted by the Secret Service to find the person who murdered the inventor of a top-secret device.
Charlie takes his time as he investigates the case of a scientist murdered for devising a way to protect US forces from German U-boats. Bedeviled by a gaggle of eccentrics, his nervous assistant (Mantan Moreland) and his exuberantly in-the-way offspring (Benson Fong and Marianne Quon), Charlie must decide which of a houseful of guests is actually the plan-purloining Master Spy!

The Chinese Cat
Number Three Son Tommy comes to the aid of a damsel is distress - by offering Charlie Chan's services - in this top-notch whodunnit fare starring Sidney Toler and Benson Fong.
Leah Manning (Joan Woodbury) has never stopped searching for her father's murderer, although the police and the DA gave up long ago. And now, to add insult to injury, an expert criminologist has written a novel accusing her mother of the crime! Charlie's investigation leads him to a cutthroat gang of gem thieves out to steal a wealth of diamonds hidden in a porcelain Chinese cat!

The Jade Mask
Some families have reunions - this one has alibis! In this thrilling 1945 endeavour, Charlie Chan (Sidney Toler) finds himself at odds with an entire family, any one of whom could be a killer!
Helped by his pseudo-intellectual Number Four Son (Edwin Luke) and his panicky assistant Birmingham Brown (Mantan Moreland), Charlie investigates the recent murder of a brilliant but much-loathed scientist (Frank Reicher) who invented a gas that makes wood as strong as steel. But the investigation is anything but elementary, as Charlie sleuths his way through suspicious scientists, sultry sisters, a silent cousin and a butler with a very stiff upper lip!

Also includes, Meeting At Midnight, The Scarlett Clue and The Shanghai Cobra.