A wild and dangerous mountain setting and a daughter who lives, breathes and sleeps horses is a recipe for trouble for ranch owner, Sandy Scott. But Kirstie is undaunted by her mother's warnings. She's at her happiest riding the trails through the tall forests and deep canyons of the Meltwater Range . . .
Watching a neighbouring rancher break in new horses, Kirstie is horrified by the treatment of one strong-willed mare, Midnight Lady. In a desperate bid to free her, Kirstie pays a secret night-time visit to the ranch. But the plan backfires: not one, but eight horses escape and disappear into the mountains! Now Kirstie is in big trouble - should she own up? And if she does, will she ever see Midnight Lady again?