Railroad Detective Matt Clark (Jim Davis) and his assistant Frankie Adams (Mary Castle), investigate.

Matt Clark sets out on the trail of a gang of cattle rustlers led by one of the West's youngest and most notorious outlaws, Billy Bonney, aka Billy the Kid.

Matt Clark and his assistant pursue the vengeful James brothers, Frank and Jesse, who declare war on the law after their young half-brother is killed in a police ambush.

Railroad detectives Matt Clark (Jim Davis) and Frankie Adams (Mary Castle), go after Apache chief Geronimo (Chief Yowlachie).

Detectives Matt and Frankie are asked by Colonel Marsham to infiltrate the vicious Quantrill gang. They do so on the eve of the Lawrence Kansas massacre that they are unable to prevent. Matt vows to track down Quantrill personally.

Matt and Frankie head to Sweetwater, Wyoming where major cattle ranches are suffering heavy losses. A woman nicknamed Cattle Kate becomes the focus due to the number of livestock she sells despite her small operation.