Cali had spent most of her life under her grandfather's wing, and it wasn't easy convincing him that she knew what she was doing when she decided to begin rescuing horses with her best friend, Sam. But when Sadie's Farm was destroyed by a pair of greedy brothers, the fate of a horse named Olivia was left in the girls' hands and they promised to do everything they could to save her. A desperate twist of fate may change the plan and force the girls to abandon their promise—and Olivia.