After a tragic accident, fifteen-year-old Amy must cope with heartache and family conflict when her British sister Lou comes to Virginia to help manage Heartland, the family's shelter for abused horses.

Amy is upset when her horse Pegasus appears to be dying.

Malory is invited to try out for an exclusive summer riding team. Caleb, the boy she's liked all year, is trying out, too. But if she makes the team, she won't get to see her father or her favorite horse, Tybalt, until the fall. She must decide if the honor of being on the team is worth the price.

Amy tries to help Gallant Prince, a horse that has been traumatized by a fire in its stable.

Amy agrees to train Bright Magic, a horse which belongs to Ashley Grant's mother. While training the horse, Amy comes to see her old rival Ashley in a new light.

Amy, Ty, and Ty's father try to save seven neglected horses from the company that has been mistreating them.

Lani loves to ride but her other grades are suffering and her parents want her to change schools. Lani can't bear the thought of leaving Chestnut Hill? Can she find a way to convince her parents to let her stay?

As Amy prepares to leave Heartland for college, a new horse arrives at Heartland, but no one wants to tell her the background of this horse.