When three town marshals are murdered near Silver City, Arizona Territory's chief marshal, Simon Fry, sends aging lawman Herk Lamson on vacation and sets a trap with himself for bait. He learns four strangers have recently arrived in town - one claiming to be a salesman, one a musician, one a gambler and one a rancher - all of whom visited the towns where the lawmen were recently shot in the back.
—David Bassler