Ex-convict Hank Rogers is searching for his brother Jim, a newspaperman, and becomes involved with a group of people trying to conceal the death of the president of a large corporation so they can profit financially. With the aid of the dead man's daughter, Audrey Brandon, Hank exposes the crooks.

Humble stamp dealer Otto Becker has little to do with international politics, so when he receives a surprise visit from his estranged twin brother and Nazi spy, Baron Hugo von Detner, his world is thrown into turmoil. Threatening Becker with deportation, Hugo forces him to use his shop as a front for espionage.

A gang of bank robbers is pursued by an insurance investigator.

A detective encounters a woman in a nightclub. He finds that she is being blackmailed by a dancer who is murdered that very night. Of course, the woman becomes the main suspect. She and the gumshoe team up and begin searching for the real killer.

In this sequel to the original story, Monte Cristo count Edmund Dantes (Martin Kosleck) returns to Paris to get revenge but soon finds himself pursued by a cruel policeman. The count's brave wife Haydée throws the cop off her husband's scent by dressing up as the masked avenger herself and proving that she too is most competent with a sword.

Detective Nick Carter is brought in to foil spies at the Radex Airplane Factory, where a new fighter plane is under manufacture.

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 in his locked bedroom with a gun in his hand. While it looks like a suicide, Vance knows better and the coroner finds that Archer has been shot, hit with a blunt instrument and stabbed - making suicide unlikely. But Vance is on the case and is looking to see if government secrets have been sold and who has murdered Coe. This is a remake of "The Kennel Murder Case" using aircraft designs and espionage instead of Chinese porcelain and dog shows.

Young intern Jeff Burton, impulsively offers a lift to an odd-looking gentlemen. It soon turns out that Jeff's passenger is an inventor has just escaped from a shady sanitarium, where he has been held prisoner by Nazi spies.

In the 7th film of the "Crime Doctor" series based on the radio program, Dr. Robert Ordway is summoned to take attend a diabetic, and gives an injection of insulin taken from a bottle in the patient's pocket. The man dies and Ordway discovers that what he thought was insulin was really poison. Oops! Two other people are murdered before Ordway discovers who replaced the insulin with poison and what the motive was

An unsuccessful sculptor saves a madman named "The Creeper" from drowning. Seeing an opportunity for revenge, he tricks the psycho into murdering his critics.

When a man dies of a heart attack, a stage and radio mentalist believes he has willed him to die because he was angry with the man. Riddled with guilt, the mentalist cancels further shows, breaks off his engagement to his female partner, who can read minds while in a hypnotic trance, and takes refuge in the eerie wax-museum-cum-home of another woman friend.

After the King of Rovenia has been assassinated, Holmes and Watson are engaged to escort his son to Europe via Algiers, aboard a transatlantic ocean liner which also carries a number of suspicious persons, any of whom may be involved in a plot to also assassinate him.

A reporter sleuths the mystery behind an oft-married Viennese doctor whose wives met mysterious fates.