Summer Graham was always a horse lover. But was never aloud to get a horse. One day when out on a ride on her neighbours horse, she finds a herd of mustangs and instantly falls in love with them. Especially the stallion. Although when they get rounded up and captured, Summer is determined to save the beautiful creatures she has come to love so much, from losing their freedom. That day her life changes, she becomes one of them. She becomes a horse shifter.