Marshal Jim Craig is escorting Gil Spanner to Cheyenne to testify against Chad Farrell, but Gil is anything but cooperative and Craig is now nursing broken ribs. With Farrell's men on their trail to stop Spanner from testifying, the sheriff of Laramie out of town, Craig takes Spanner to Sherman Ranch for help, putting Slim Sherman and Jess Harper in the thick of things. They find an unlikely ally in Val Farrell, Chad's wife, who wants nothing more than to see her husband hang. They are trapped in the ranch house with Farrell's men on every side and their own numbers dwindling. With night falling and Slim already wounded, it's up to Jess and Spanner to take a huge gamble and try and catch Farrell's men in a crossfire so they can survive.