Nancy and Bess travel to Costa Rica with their best friend George as she prepares to participate in La Ruta de los Conquistadores, a 3-day mountain bike race. It soon becomes clear that someone will go to great lengths to make sure top cyclist Derek Woodhall doesn't win. Leave it to Nancy Drew to be on the case no matter where she is....

Trails of Treachery 2009, Simon & Schuster Childrens Books, London

ISBN-13: 9781847385499

Mass-market paperback

Trails of Treachery 2007, Aladdin Paperbacks, New York, NY

ISBN-13: 9781416935247

Trade paperback