Darby Carter loves horses, even though she's never actually ridden one. Darby's grandfather is an expert riderāin fact, he owns a horse ranch in Hawaii. So when he agrees to take her ināalong with the beautiful mustang Darby saved on the range in Nevadaāshe knows she can't refuse, even if she is a little terrified! But Darby's filly arrives in bad shape, and Darby's grandfather wonders if the wild horse will ever trust a human again. Can Darby take the reins and save her horseāor has she lost the mustang forever?