Rosemarie Holt is a student at Osborne High. She’s a tough, capable girl who was raised on a farm across the cornfield from Ollie. A talented barrel racer, Rosemarie has dreams of competing nationally. When Principal Stanton announces over the intercom that Rosemarie has won the barrel race at the Sloane County Championship Rodeo, Ollie darkly jokes that Rosemarie had better watch out—her success could attract the attention of the Osborne Slayer. By coincidence, Ollie ends up being right—on the eve of Halloween, David Ware attacks Rosemarie at her family’s farm. Luckily, Makani, Ollie, Darby, and Alex arrive in time to chase away David and rescue Rosemarie.