Susan Hart, assistant to private detective Russ Ashton, is given a camera concealed in a hat box and assigned to take a picture of a woman. A gun is accidentally hidden in the box and the woman is killed. Susan is charged with murder, but Russ and his less-than-useful associate, Harvard, get on the case.

U.S. Marshals "Nevada" Jack McKenzie and "Sandy" Hopkins go undercover to bust a gang of stagecoach robbers in this vintage Western serial. Nevada infiltrates the gang, while Sandy works as a cobbler in town, keeping an ear open for local gossip as they try to flush out the inside man tipping off the crooks.

Former crook 'Square' Kelly serves in the First World War. When he returns from the war, one of his comrades-in-arms convinces him to join the police force. But Kelly finds himself confronting the very criminals who made up his old gang.

A sleazy lawyer's female assistant sets out to end his cheating ways.

Outlaw Black Deering leads a band of desperadoes, but decides to give up the bandit life. Agreeing to go on one last job with his gang, he is captured when his henchman Jordan betrays the gang for the reward. Deering escapes and determines to avenge himself on Jordan.

Robert must avenge his son who was killed in a workplace accident.

Dr. Janos Rukh discovers a certain type of radium that has almost magical healing properties. But the element has a dangerous side, too, and it has already started affecting Rukh. Consumed by paranoia, he begins to suspect that his wife is having an affair. Wild for revenge, Rukh hatches a deadly plot...using his own poisoned body as a weapon to kill.