Broncho Billy and his pal, after robbing the stagecoach, divide the loot and part company. Among the valuables in his share. Broncho finds a well-worn Bible and, after skimming over the pages with a grim smile, he puts it in an inside pocket and rides into town. In the saloon, a poker game is flourishing and "Quick-Draw" Kelly, a notorious cheat and gun-man, is cleaning the cowboys of their earnings. Broncho sits in the game, detects Kelly sliding an ace from the top of his boot, calls his cheating at the point of his gun, brands Kelly with disgrace and kicks him out. Burning with revenge, Kelly tries to kill Broncho with a shot through the open door, but the bullet lodges in the Bible and saves Broncho's life. Picking the bullet from the pages, Broncho replaces the holy book in his pocket, rushes out, mounts and starts after the escaping ruffian. After a thrilling chase, both dismount and take to the rocks. Higher and higher Kelly ascends until the distant plains stretch before him miles below. Broncho now rolls a heavy boulder off to one side of Kelly, who instantly empties his gun in the direction of the sound, thinking it to be Broncho. Before he can reload. Broncho corners him and a terrific hand-to-hand struggle now ensues on the very brink of the yawning chasm. Back and forth they sway until Broncho forces Kelly to his knees, then picks him up bodily and is about to cast him over the precipice, when the Bible falls from his pocket and Broncho sees the words: "Thou Shalt Not Kill" open before him. For a moment he fights with himself, then allows Kelly to escape unmolested. Bible in hand, he finds a seat against the rocks and begins the faithful study of God's Word, and the following Sunday finds him in the church for the first time in his life.