Phantom Stallion #6: The Challenger

Cougars have been spotted nearby, but they haven't hurt the ranch horses - yet. So Samantha is outraged when a neighboring rancher vows to kill the mountain lions on sight.  

Her family's horses may be safe, but out on the range Sam spots a wild young stallion without a herd. Being alone puts this horse in danger. Sam is determined to protect the rebellious mustang and still save the cougars.