While they try to deal with the fragile state of affairs---and find the person behind the harassment---the three adults decide the best thing to do is to remove Elizabeth from the situation. Since Anna is about to start her new post as Acting Chief Ranger at Acadia National Park in Maine, the three will join her and stay at a house on the cliff of a small island near the park, Boar Island.

But the move east doesn't solve the problem. The stalker has followed them east. And Heath (a paraplegic) and Elizabeth aren't alone on the otherwise deserted island. At the same time, Anna has barely arrived at Acadia before a brutal murder is committed by a killer uncomfortably close to her.