Slim Sherman becomes a target of one man's vengeance when Ed Farrell sends a letter to the late Matthew Sherman vowing to kill him for what he did years ago.

The former marshal of Dodge City arrives in Laramie at the same time that Slim is seeing Jess Harper off on a cattle drive with the combined herds of several area ranches.

It's winter, the Sioux are at war, and the Wyoming Territory has become their battleground.

In need of some extra money, Slim and Jess take jobs as drovers on a cattle drive, and Jonesy tags along with them.

When Jess serves as a special deputy to transport a man who's accused of killing his wife, the stagecoach is attacked by a group that's looking for the prisoner.

It's Christmas at Sherman Ranch and Relay Station, but the Sioux are on the warpath.