Former Texas Ranger and veteran of the Texas War for Independence, Captain Hank Tomlinson has retired to life in Luck, the town he founded in the new state of Texas. Now the owner of the Broken Arrow Ranch, he knows his new Kentucky Thoroughbred mare is bound to win the annual race, beating out his rival, Jack Brennan. But when his son, Jay Blue, and cowhand Skeeter allow the horse to be stolen, the boys set out to bring her home rather than face the Captain's famous hot temper. They soon find that to get their horse back, they'll need the help of the mysterious Jubal Hayes, a mustanger with an unusual appearance and a dark attitude.
Meanwhile, the brutal murder of a stranger leads to a bloody battle and incurs the wrath of Comanche warriors bent on revenge. As the Texas wild becomes more and more deadly, Hank must track down the boys before they get caught in the crossfire. But he'll find the gravest danger to them all comes from a secret of his own past.