What Castle Rock does for Maine Monsters in the Green Mountains does for Vermont. Six go into the woods. Three come out.Addie Preston a new mental health counselor is flattered when her colleague asks her to co-lead an intensive Ecotherapy weekend for a small group of clients. The band of six head into the remote trails of the Green Mountains.As a storm engulfs the area the group takes refuge in a cave off of the trail. No one is prepared for what they will discover.Or what will discover them.