Sanctum

Dan, Abby, and Jordan were traumatised by the summer they shared at New Hampshire College, the former site of the Brookline asylum. They want to move on, but someone is determined to keep the terror alive by sending them anonymous photos of an old-time carnival.
Forsaking plans to never to go back, the teens return during a weekend for prospective students, and realise that the carnival from the photos is not only real, it's here on campus.
As Dan and his friends visit abandoned houses and hidden places of the surrounding town, they realise that Camford is hiding a terrible past, and the influence of the asylum runs deeper than they ever imagined.