Watch out, Hollywood-here comes Rosie! The year is 1912 and with the success of Papa's latest baseball film, 13-year-old Rosie and her family move to beautiful Los Angeles to shoot more films starring Rosie. And there's no wasting time; within days of unpacking, Papa brings home an entire Wild West show so he can make authentic Westerns. Rosie's so excited about riding a horse for the first time that she forgets to watch her step-and before she knows it, she's caused a terrible accident for the show's best trick rider. Where will Papa's Western movies be without a real trick rider....and with a star who doesn't even know how to get on a horse? Enter Zach, the son of the injured rider. Rosie finds him simply irritating! And just when it seems that things can't get worse, she and Zach get hopelessly lost in the hills. All they have to get past the mountain lions, rattlesnakes, and other enemies in the wild are their wits, their skills, and each other. Can Rosie and Zach set aside their differences and brave the challenges ahead?