The Phantom Stallion books, first published in 2002 by Avon Books, are a series written for young adult readers by American Terri Farley. The main character is a girl named Samantha "Sam" Forster who shares a unique bond with a wild horse called The Phantom Stallion. Having spent two years away from her family's Nevada ranch to recover from a riding accident, Sam returns home to find that things are never easy where horses are concerned. There are 24 books in the series with one million copies sold worldwide. Almost every book has a new equine character as its focus and Sam and her friends battle horse thieves, cougars, earthquakes and more to keep their horses safe.