It's been two years since Sam's horse, Blackie, threw her in a near-fatal accident. She's been separated from her family, her ranch, and the wild mustangs she loves. Now she's home again, but her beloved horse has been missing since that fateful day. Then one night, a mustang comes to Sam. Is it Blackie, grown up and gone wild? Is it the legendary stallion known as the Phantom? Or could it be both?