Mandy and James are having trouble finding enough time to give Chamomile—a mare whose owner has left the country—all the attention and exercise she needs. When they meet Rhian, a girl who lives next to Chamomile's field, they hope she will help them out. But Rhian doesn't want to get to know the horse—and she doesn't want to tell anyone why not.

Can Mandy convince her new friend to care for Chamomile—or will the horse have to be sold?