Zachary Hallock moves to the town of Timberline with his son Josh to start a farm. In town, young Josh meets a boy named Daniel Skaggs who has an older sister, Sarah Jane. A shootout in the street results in the sheriff's death. A pair of brothers, Jonah and Gus Varden, are continuing their violent reign of terror throughout the region. Zack is broke. He works hard farming, but doesn't prosper. One day when Sarah Jane brings muffins and they get acquainted, she joins Zack and Josh on a visit to George Hadley's horse farm. Hadley offers to trade two horses for Zack's first grain harvest. Hadley strongly urges Zack to join the "Regulators," who try to maintainlaw and order the area with the sheriffdead. Zack declines, to his son's disappointment. Josh later sees the Vardens ambush and kill a Pinkerton's detective. Josh goes to get Zach and return to the scene of the shooting. Jonah was hiding nearby and overhears Zack order the boy not to report what he saw. Zack's wagon, carrying grain for Hadley, is waylaid by the Vardens, ruining the grain. Knowing now that Zack wants to marry Sarah Jane and is desperate for money, the Vardens approach him about joining them on a robbery. Zack agrees. Josh follows his father the day of the robbery and witnesses the crime. Zach returns to his farm with a new wagon and team of horses. He lies and tells Sarah, Daniel and Josh that he won the money needed to buy them in a card game. Sarah Jane marries Zach, but soon suspects his wrongdoing during his numerous nightly disappearances. Zack confesses that he is actually a Pinkerton's man himself, working undercover. He couldn't risk telling her, Josh, or the regulators, because he needed to find out who the ringleader was. Hadley is the true criminal ringleader and he kidnaps Josh. A fight develops and Zack is able to take care of Hadley and the remaining Varden brother. His original plan was to leave Timberline once his work was done, but Zack elects to keep the farm and make a family with Josh, Daniel and Sarah Jane.
