 Chap. 1 UNTAMED: Trying to steal a valuable race horse, Canfield kills a Ranger and the Ranger s brother Bob comes looking for the killer. Just as he catches the Wild Boy whom he thinks may be the killer, the horse now wild attacks him. Chap. 2 CHASM OF DEATH: Bob ducks just as a man shoots at him and a murder suspect is hit. A group of riders then chase Bob and the Boy who fall down a chasm. Chap. 3 DOOM RIDERS: Finding the man Bates that shot at him, Bob learns of a raid that night and goes to investigate. Chap. 4 VIGILANTE LAW: After Bates kills a rancher, Bates convinces the Sheriff that Bob killed his partner. Bob then tries to escape from the Sheriff Chap. 5 SILENT CALL: Canfield plans to kill Lee Weston who has double-crossed him. Getting a heliograph signal from Lee s sister Linda, Bob catches up with Canfield but he and Lee go over a cliff in Canfield s car. Chap. 6 HEART OF THE MYSTERY: Bob finds his brother s horse and sees the name Boyd on the hoof. He plans to have the boy who witnessed the murder look at Boyd. Chap. 7 BATTLE OF THE STRONG: Bates catches the Devil horse but when Bob catches him and they fight, the truck goes over a cliff. Chap. 8 MISSING WITNESS: The Boy who has regained his power of speech relates the story of the man killed by Bates (chap. 3 flashback). Chap. 9 SHOWDOWN: The Boy relates the story of the Ranger s murder (chap. 1 flashback) Chap. 10 DEATH TRAP: Bob finally learns Canfield is the man he wants. Chap. 11 WILD LOYALTY: Boyd relates how Canfield tried to steel the horse and then killed the Ranger (chap. 1 flashback) Chap. 12 DOUBLE DECOY: The Boy captures Canfield and then relates how Canfield killed his father (chap. 1 flashback). But Canfield s men are able to free him and he flees.