When Franny finds some unusual things in the woods on Timber Island, she begins to suspect that something bad is going to happen. Jack and J.J. get curious and together, the kids begin to unravel a mystery that connects a long history on the lake. Now that the kids are a little older they get more daring as they look for clues and work to solve the mystery. They soon discovered that they are not the only ones who want to protect the beauty of Lake Winnipesaukee. Andy Opel