Zane Grey 
Wildfire 

'Wildfire’ is the story of Lucy Bostil, the daughter of a stable owner, who happens upon Lin Slone, knocked unconscious while chasing his unruly colt Wildfire through the hills. When Lin convinces Lucy to ride Wildfire in the upcoming race, the villainous Cordts will stop at nothing to make sure that it is his horse that wins the race instead. 'Wildfire’ is a classic tale of western suspense and adventure from one of the most prolific and popular authors of the genre, Zane Grey.