Mackenzie is a 15 year old girl who is absolutely obsessed with horses. For her birthday, she gets her very own horse. Her horse, Stanley, is a super fast American Quarter Horse that is amazing at barrel racing. But Mackenzie needs to keep up her grades and get a job of she wants to keep Stanley. After a horrible barrel racing accident a huge vet bill needs to be payed. Will Mackenzie have enough money? Will Stanley survive?