A struggling young engineer, Bob Sanderson, refuses to marry the very-rich Edith Stuart until he can support her on his own earnings. He goes to work for her father as a messenger in the telegraph business, and, via his engineering skills, discovers a plot to kidnap Edith.

Four flying G-Men protect America against enemy spies; one of the four assumes the identity of The Black Falcon, to befuddle the saboteurs even further.

The superintendent of a women's prison is pressured to pardon a member of a criminal gang. When she refuses, her daughter is framed on a manslaughter charge and sent to prison.

The Hollywood Post's sports writer, Jimmy Jones (Charles Quigley), yearns to be a crime reporter, and thus looks for foul play on even the most routine assignments. In writing a piece about a girl's softball team, Jimmy discovers that their sponsor, Foy Harris (John Gallaudet), is a notorious racketeer who has supposedly gone straight. Jimmy suspects Foy is still up to no good. He begins hanging around the team to do a bit of snooping, and also to be near the cute new pitcher, Ann Casey (Jacqueline Wells).

Homer Crow, fired from his laboratory job at the Dunn-Wright Rubber Company, is sure that his formula for an indestructible rubber, called Durex, will be a success. Others are also, and Honer endures many obstacles, prat-falls and staged accidents while striving to protect his inventions.

Ferguson is a rough-and-tumble hockey player who discovers that his chosen profession is nothing more than a racket, a plaything for game-fixing racketeers. When his brother is killed in a highly suspicious accident, Ferguson and team trainer Holland join forces to bring the killers to justice.

A thief on the run dumps some hot money in Thelma and Patsy's lap.

After being criticized by the Citizens' League for his inability to cope with a crime wave, Police Captain Haines orders his men in the Homicide Bureau to clean up all their cases, but without violating the constitutional rights of any suspect. Detective Jim Logan is ordered to meet the incoming new-head of the Police Department lab and internal affairs, J.G. Bliss, and takes an instant dislike to her over her attitude toward criminal's rights.

An attorney handling a murder case is unaware his own wife played a crucial role in the killing.

An accused killer is granted a reprieve when his victim returns to town in the flesh after an eight-year absence.