When thirteen-year-old Samantha returns home to her familys cattle ranch in Nevada, shes nervous. She moved away two years ago to recover from a bad fall off her beloved mustang, Blackie, and shes still not sure she can get back in the saddle. Shes having trouble bonding with her new horse, Ace, the other ranchers treat her like the bosss spoiled daughter, and Blackie has been missing since the day of Sams fateful accident.But thats just the beginning. On a moonlit night, a mustang comes to Sam. Is it Blackie grown up and gone wildor the legendary phantom stallion? When Sam suddenly finds the fate of the horse resting in her hands, she has to be a real cowgirl, ready or not.