When a chance encounter sparks an unlikely bond between rival murderers Sloane and Rowan, the two find something elusive—the friendship of a like-minded, pitch-black soul. From small-town West Virginia to upscale California, from downtown Boston to rural Texas, the two hunters collide in an annual game of blood and suffering, one that pits them against the most dangerous monsters in the country.

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.

Connecticut, 1666. An ancient spirit awakens in a dark wood. The wildfolk call him Father, slayer, protector. The colonists call him Slewfoot, demon, devil. To Abitha, a recently widowed outcast, alone and vulnerable in her pious village, he is the only one she can turn to for help. Together, they ignite a battle between pagan and Puritan - one that threatens to destroy the entire village, leaving nothing but ashes and bloodshed in their wake.

These people will give anything for the idols they worship, be they rock stars, actors or authors. Or even serial killers. Lori is just such a fanatic. Her obsession is with Edmund Cox, a man of sadistic cruelty who butchered more than 20 women. She’s gone so far as to forge a relationship with him, visiting him in prison and sending him letters on a regular basis. She will do anything to get close to him, so when he gives her a task, she eagerly accepts it. She has no idea of the horror that awaits her.

Grayson Hale, the most infamous murderer in Scotland, is better known by a different name: the Devil’s Advocate. The twenty-five-year-old American grad student rose to instant notoriety when he confessed to the slaughter of his classmate Liam Stewart, claiming the Devil made him do it. When Hale is found hanged in his prison cell, officers uncover a handwritten manuscript that promises to answer the question that’s haunted the nation for years: was Hale a lunatic, or had he been telling the truth all along?

One Christmas Eve in a small hollow in Boone County, West Virginia, struggling songwriter Jesse Walker witnesses a strange spectacle: seven devilish figures chasing a man in a red suit toward a sleigh and eight reindeer. When the reindeer leap skyward, taking the sleigh, devil men, and Santa into the clouds, screams follow. Moments later, a large sack plummets back to earth, a magical sack that thrusts the down-on-his-luck singer into the clutches of the terrifying Yule Lord, Krampus.

Strang isn’t the small, quaint town it appears to be. It’s haunted every night by a creature the townsfolk refer to as Halloween. Once the sun sets each day, Halloween emerges to collect its treats: a small, live offering from each household. The residents comply because no one wants to be the target of Halloween’s tricks. 

Lily Horne is a drama queen. It's helped her rise to stardom in the school play, but it's also landed her in trouble. Her parents warn her that Florida has to be different. It's a fresh start. No theatrics. But this time, the drama is coming for her. The Hornes' new house is awful. The pool is full of slime; the dock is rotten; and the swamp creeps closer every day. But worst of all, the house isn't empty...it's packed full of trash, memories, and, Lily begins to fear, the ghost of the girl who lived there before her. And whatever is waiting in the shadows wants to come out to play.

Children have always disappeared under the right conditions - slipping through the shadows under a bed or at the back of a wardrobe, tumbling down rabbit holes and into old wells, and emerging somewhere...else. But magical lands have little need for used-up miracle children. Nancy tumbled once, but now she's back. The things she's experienced...they change a person. The children under Miss West's care understand all too well. And each of them is seeking a way back to their own fantasy world.

September. A beautiful New York editor retreats to a lonely cabin on a hill in the quiet Maine beach town of Dead River - off season - awaiting her sister and friends. Nearby, a savage human family with a taste for flesh lurks in the darkening woods, watching, waiting for the moon to rise and night to fall.