The Mystery of the Masked Rider
by Carolyn Keene
/MEGA-BOOKS In this new adventure, Nancy's friend Colleen is preparing to jump her beloved horse, Nightingale, in the Midwest International Horse Show. The prize-winning filly is worth a cool $200,000, and that kind of cash can breed plenty of greed, ambition, and danger. Soon Nancy has her hands full trying to stop a mysterious culpri