Justis Colt by Don Bendell

When Texas Ranger Justis Colt is ambushed by a gang of murderers, a mysterious stranger called Tora enters the fray to save Colt's life. But the Comancheros, a motley crew of outlaws and cutthroats, demand revenge and kill Tora's wife and two sons. Vengeance, however, becomes a double-edged sword as Colt and the man called Tora face the great challenge of hunting down every Comanchero involved in the killing of Tora's family. While Justis Colt knows how to walk on the right side of the law, he also knows how to use his guns to bark out the final reckoning of justice in an untamed land...