Dan, Abby, and Jordan are still traumatized by the summer they spent in Brookline. While they try and move forward, someone is intent on keeping the terror fresh and sends them disturbing pictures from an old fair. Dan also receives a list of coordinates that show historic homes near the asylum. He is convinced that the only way to put an end to this nightmare is by returning to New Hampshire and follow the clues. When the three show up at the school posing as potential students, they find the campus celebrating Halloween. When the teens escape their hosts to visit the places on the list, they discover a secret much darker than they had ever imagined. A person could lose his sanity in Sanctum.
