The fictional retelling, from the point of view of Annie Bronn Johnston, of how this Nevada woman fought to protect the American wild horse, the mustang, from extinction because of professional killers who chased the horses for use in dog food.
After Ruby, the owner of a neighboring lodge, gets sick, Meg and Thomas decide to help her and watch after her ten-year-old son, Tyler, who releases ranch horses that Thomas gets lost trying to find.
Samantha is excited when the Phantom Stallion's new foal is ready to be born and is sure she can handle things while everyone is off on the cattle drive, but she begins to have her doubts when a dangerous thunderstorm hits the ranch and the Phantom arrives to take his new filly back to the wild.
An introduction to mustang horses, describing their physical characteristics, history, breeds, and uses, and discussing the mustang adoption program in the U.S.
Examines how the growing population of wild ponies on Assateague Island is affecting the environment and discusses the work of Dr. Ron Keiper and Dr. Jay Kirkpatrick, who have sought to discover a birth control strategy to solve the overpopulation problems.