The Haunting of Horse Island — Carolyn Keene

GHOST RIDERS' HIDEAWAY!

Friends of George's parents invite the girls to visit their rustic retreat in upstate New York. With its riding stables and canoes, the resort seems a dream come true. But before Nancy can hitch up her hiking boots, she discovers that the natural beauty of the place has been overshadowed by a supernatural mystery!

A series of threatening messages, a poisoned picnic, and tales of a haunted mansion on the resort's supposedly deserted island have sent many of the patrons packing. But wild horses couldn't pull Nancy away. She's out to uncover the truth behind THE HAUNTING OF HORSE ISLAND before the entire resort ends up a ghost town.