Bob Haddington, son of Colonel Haddington, leads a posse against marauders in a settlement. During his absence, one of the prize horses is stolen and his father is killed. Bob swears revenge and becomes known as Velantrie, leader of a band of semi-outlaws, and befriends a priest, Father Hillaire. At a mission, he meets Val, daughter of John Hannon, a wealthy ranchowner. Later, Bob is suspected of being the feared "Black Rustler," but he learns that Hannon is indeed the guilty party and the man who killed his father. Bob decides to leave; but he meets Hannon, who has been wounded, and exchanges places with him. Hannon confesses to Val and dies in her arms; she rides to rescue Bob just as he is about to be hanged.