Colonel MacKenzie is traveling on a train in a private rail car with Lark Walters, the young and sheltered daughter of a wealthy friend of his. At a stop in a town, he and her see a young man shoot another man in self-defense in the street. Later, MacKenzie while on the train sees the same young man being lynched. He stops the train to save him and brings him onto the train to help him escape, where the overly romantic Lark falls for the young stranger as MacKenzie tries to help him. MacKenzie tries to keep them apart, but Lark won't give up. Meanwhile, other men on the train hatch up a scheme to kidnap Lark and hold her for ransom. They recognize Tate who was in prison with one of them so he has an outlaw background. They try to get the young man, Tate, to join with them. This episode introduces Tate as a series regular as Col. MacKenzie offers him a job at Shiloh.