No Trespassing introduces 12-year-old Parker Wilson. He has his friends. He has his family. But what he tends to lack is courage. Finally reaching his breaking point of people picking on him, he wants to prove to everyone around him that he can be brave. Just days before Halloween, and the 45th anniversary of the town's massacre, he pressures his friends into joining him in going into the most horrific place in Chestnut Hill. Reluctantly, the group of friends head to Grady Hospital, unaware of what awaits them on their journey.