Samantha can't wait for the holiday break from school. But there's no time to relax: Brynna's baby is due any day; the local authorities are gathering more mustangs from the range; and her best friend Jen's ranch is in upheaval–its owner, Linc Slocum, has just been arrested, and no one is sure what will happen to Jen and her family.

But then, disaster strikes: A terrible blizzard traps the Phantom Stallion's band. Sam has to help them, but she's terrified they'll be captured. Can she save her beloved mustangs and keep them free–for good?