When Jess Caird, owner of the White Sage range, finds one of his cowhands murdered and his barn set on fire, he sets out with two old-timers to bring the culprit to justice. Evidence points to Grote, a notorious gunslinger and killer, and the trail leads Caird and his companions to the town of Sand Ridge. There they encounter big-time business man, Dugmore, who has set up his Pony Express operation, where Caird's nephew is in employment. Jess can't work out newcomer Dugmore - is he a shrewd businessman or something more sinister? Is there a connection between Dugmore and Grote? Caird and his side-kicks battle their way through constant peril as they fight to reveal the truth.