The nefarious Dr. Fu Manchu searches for the keys to the tomb of Genghis Khan, in order to fulfill a prophecy that will enable him to conquer the world. His nemesi, Dr. Nayland Smith and his associates fight to keep the evil doctor from getting his hands on the keys. In 1943 the serial was edited...
Dr. Ralph Snyder and Dr. Frank Blake open an office together but soon split over a rivalry for nightclub singer Diana Wayne and a difference over ethics.
In California's Death Valley a chemistry whiz-kid helps a sheriff track the man who murdered a wealthy mine owner who had been staying at a fancy winter resort.
Assistant District Attorney Jeffery Powell has just sent an innocent man to prison for the murder of a gambler. Powell is in love with, Marion Courtney, but he's unaware that Marion is the sister of the innocent man he sent to prison. Marion gets herself committed to a women's prison to get proof...
In the midst of the Civil War, Lassiter has a plan to get control of California. Working out of St. Joseph, he plans to send forged messages to the troops on the west coast via Pony Express. First he attempts to bribe Pony Express ride Roy Rogers. When Roy refuses he turns to the outlaw Johnson and...
Driven to desperation by his young and extravagant wife, alienist Dr. Emil Brandt has arranged a perfect crime; now he begs the police to lock him up before he can commit it.
Philo is in Vienna working for the US Government to see if Archer Coe is selling aircraft designs to foreign powers. He grabs the plans with Archer's signature, but is captured by police before he can escape. Deported he comes back to America and plans to confront Archer, but Archer is found dead...
A young woman is involved with a married man, although she does not know that he is married. He kills his jealous wife and implicates her in the murder. However, a playboy character who had been flirting with the woman earlier turns amateur detective and clears her.
A young captain hoping to replace the U.S. Army's horses with mechanized vehicles faces court-martial after his commanding officer, who's opposed to modern changes, is killed.
A young man just released from a reformatory moves to a new neighborhood with his sister, intending to start a new life. However, he gets mixed up with the local mob boss and corrupt politicians and soon finds himself being framed for an arson and murder he didn't commit.
An aspiring theater producer convinces his wealthy uncle to finance a play on the condition that he lives the play’s far-fetched plot: making a cross-country trip with no money.
