Warren Hollis is a seasoned true-crime writer. He likes to submerge himself in the local culture when he writes, so he packs his essentials and heads to Knorr, Pennsylvania. It's a tiny town in western PA, the kind of town most people on their way to Pittsburgh or New York would drive right past. It's a town full of friendly, smiling people, but it hides a dark past. Years ago, a man began sneaking into the bedrooms of young girls and taking them under the cover of night. Days later, a grisly calling card would be left for the families to find.