The Mystery of the Masked Rider by Carolyn Keene

Nancy's friend Colleen Healy has worked long and hard to make her beloved horse, Nightingale, a champion jumper. But now with the Midwest International Horse Show approaching, she's beginning to have second thoughts. Someone's trying to hurt the horse and hurt her, turning Colleen's love of Nightingale into a nightmare! The prize-winning filly is worth a cool $200,000, and that kind of cash can breed plenty of greed, ambition, and danger. Nancy's only chance to horse-collar the culprit is to play some Halloween tricks of her own, don a disguise, and make herself the bait. But her performance had better be perfect - or she could end up taking the roughest ride of her life! - from the back of the book. Book Details: Author: Carolyn KeeneTitle: The Mystery of the Masked Rider (Nancy Drew #109)Publisher: Grosset & DunlapPages: 154Dimensions: 7.75 x 5 x 0.75"Weight: 7.1 ozFormat: Hardcover