When Sarah's grandfather gives her a beautiful horse named Boo, Sarah quietly trains in city parks and gritty alleys. But when her grandfather falls ill, and Sarah must juggle horsemanship with school and hospital visits. Natasha, a young lawyer, is reeling after her failed marriage. Still, when the willful fourteen-year-old Sarah lands in her path, Natasha impulsively decides to take the girl under her wing. But Sarah is keeping a secret - a secret that will alter all their lives forever.