Zane Grey's Wildfire

While on a training ride on the ranch race horse Sage King, Lucy Bostil finds a roped wild stallion tangled in a bed of cactus. She rescues the horse and soon afterwards finds Lin Slone, the man who roped it, who has an injured back. After both Lin and horse recover, Lucy enters the stallion, now named \"Wildfire\", in a big race, competing against her father's champion Sage King.