Drummond's girlfriend is kidnapped by his enemies and he along with his friend Nielsen, an inspector from Scotland Yard, follow the trail and try to rescue her from the kidnappers.
Bob Terry is in love with Lois Borden the daughter of his employer, John Borden. When some bonds are missing from the office, Bob is accused and because of Borden's strong sense of obligation to his stockholders, Bob is railroaded to prison. A few years later, the real thief is apprehended and Bob is released. He now begins his plan for revenge against Borden with the aid of his prison cell mate Todd and a gangster, John Carmody. Soon, some bonds are missing again and Borden knows Bob is involved but because Bob has suffered at his hands before, Borden assumes the responsibility and is about to be sentenced to prison. Todd is shot while trying to steal the bonds back from Carmody, but gets the bonds back to Bob and, before he dies, begs Bob to return them to the owner.
Mary Lou manages to escape abduction by a prostitution ring. She tells the Chief of Detectives they were planning to take her to the Berrywood road house, a well-known den of iniquity. Jim Murray and beautician Belle Harris are using her beauty shop to recruit floozies for their road house circuit. Dona Lee, who works at the beauty salon, is falling in love with young reporter wanna-be Phillip, but Murray gets jealous and makes life rough for him. Meanwhile Dona begins to figure out the racket, but becomes threatened by Murray's unwanted advances.
Holmes takes a vacation and visits his old friend Sir Henry Baskerville. His vacation ends when he suddenly finds himself in the middle of a double-murder mystery. Now he's got to find Professor Moriarty and the horse Silver Blaze before the great cup final horse race.
Cowboy Larry O'Day and his sidekick Lucky Smith happen upon a distraught Barbara Hartwell, who is about to be arrested for the murder of her uncle. With Barbara behind bars, Larry is determined to find the real killer and soon finds himself in the middle of a mystery involving crazed German entomologists and a smuggling ring bringing Chinese "picture girls" across the Mexican border for sale to wealthy Chinese bachelors.
A industrialist has a row with his son, who leaves home. Meanwhile, both his assistant and solicitor conspire to embezzle a fortune in bonds. A plucky young newspaper reporter pursues the rich man's daughter.
A music professor is fired from his job for not knowing enough about modern "swing" music. He goes to Chicago to learn more about the subject in hopes of getting his job back, but he winds up getting mixed up with gangsters.
A federal agent and a female reporter team up to catch a criminal gang that has kidnapped a scientist in order to get his formula for a new type of poison gas.
Sir James Blake has retired from Scotland Yard so that he can assist his niece Hope and her friend Jerry in developing an apparatus they have invented. Sir James thinks that their invention has the potential to prevent wars, and plans to donate it to the League of Nations. But a gang of criminals led by the elusive "Scorpion" steals the device, and Blake and his associates must recover the invention and determine the identity of the "Scorpion".
When a hard-working machinist loses a promotion to a Polish-born worker, he is seduced into joining the secretive Black Legion, which intimidates foreigners through violence.