When Margaret and her husband Hal bought the large Victorian house on Hawthorn Street—for sale at a surprisingly reasonable price—they couldn’t believe they finally had a home of their own. Then they discovered the hauntings. Every September, the walls drip blood. The ghosts of former inhabitants appear, and all of them are terrified of something that lurks in the basement. Most people would flee. Margaret is not most people. Margaret is staying.

St. Vincent's Orphanage for Boys. Turn of the century, in a remote valley in Pennsylvania. Here, under the watchful eyes of several priests, thirty boys work, learn, and worship. Peter Barlow, orphaned as a child by a gruesome murder, has made a new life here. As he approaches adulthood, he has friends, a future...a family. Then, late one stormy night, a group of men arrive at their door, one of whom is badly wounded, occult symbols carved into his flesh. His death releases an ancient evil that spreads like sickness, infecting St. Vincent's and the children within.

This forest isn't charted on any map. Every car breaks down at its treeline. Mina's is no different. Left stranded, she is forced into the dark woodland only to find a woman shouting, urging Mina to run to a concrete bunker. As the door slams behind her, the building is besieged by screams. Mina finds herself in a room with a wall of glass, and an electric light that activates at nightfall, when the watchers come above ground. These creatures emerge to observe their captive humans and terrible things happen to anyone who doesn't reach the bunker in time.

Episode Thirteen takes them to every ghost hunter's holy grail: the Paranormal Research Foundation. This brooding, derelict mansion holds secrets and clues about bizarre experiments that took place there in the 1970s. It's also famously haunted, and the team hopes their scientific techniques and high tech gear will prove it. But as the house begins to reveal itself to them, proof of an afterlife might not be everything Matt dreamed of.

Carolyn's not so different from the other human beings around her. After all, she was a normal American herself once. That was a long time ago, of course - before the time she calls "adoption day", when she and a dozen other children found themselves being raised by a man they learned to call Father.