Nancy Drew 46: the Invisible IntruderBy: Carolyn Keene Series: Nancy Drew Nancy Drew, forget the ghost hunt! a male voice rasps on the telephone. Despite the mysterious warning, the teenage detective and a group of friends start out on a ghost hunting expedition to investigate five places reputed to be haunted. Danger strikes at once when Nancy tries to overtake the canoe that paddles itself on Lake Sevanee. Thrills and chills mount as the ghost hunters pursue a phantom horse and ghost