Dr. Janet Furie comes to believe that her husband and fellow scientist were set up to die in a lab accident. She blames another scientist, not only for the murder but also for taking credit for her husband's groundbreaking work. When she can't prove her husband was murdered, she spins a web of intrigue and deceit that results in the suspected scientist being framed for another murder that never actually happened.

When the nephews of Phyllis Carter are killed in an automobile crash while under the influence of narcotics, she persuades Police Lieutenant Jim Hahan to use her as an undercover agent.

A gunfighter and a cowboy help a Mexican girl avenge the land-related murder of her parents.

A prostitute sets out to frame a cop.

Mexican gunfighter Dave Robles outdraws the town's outlaw-turned-sheriff and is invited to fill the dead man's shoes. But a tin star doesn't bring automatic respectability and Robles is shunned by the town's leading citizens. His popularity with its less-savory element, particularly saloonkeeper Bannister, wanes dramatically, too, as he starts to take his job seriously. It is his love for a decent, caring woman that keeps Dave in town, but can she convince him to lay down his gun and start a new life?