Deep in the heart of Appalachia stands a crooked farmhouse miles from any road. The Morrows keep to themselves, and it's served them well so far. When girls go missing off the side of the highway, the cops don't knock on their door. Which is a good thing, seeing what's buried in the Morrows' backyard. But 19-year-old Michael Morrow isn't like the rest of his family. He doesn't take pleasure in the screams that echo through the trees.

In the summer of 1994, psychologist Daniel Hill buys a rustic farmhouse nestled in the rolling hills of West Virginia. Along with his wife and teenage daughter, the family uproots their lives in Ohio and moves south. They are initially seduced by the natural beauty of the country setting. That soon changes when they discover a hidden room in the basement with a well, boarded shut and adorned with crucifixes. Local legends about the previous owner being an exorcist come to light, but by then, all Hell has broken loose.

A group of close friends gathers at a secluded cabin in the wintry mountains of Colorado for a final holiday hurrah. Instead, it may be their last stand. First a massive blizzard leaves them marooned. Then the more chilling realization: Something is lurking in the woods, watching them, waiting.... Now a weekend of family, friends, and fun has turned into a test of love and loyalty in the face of inhuman horrors. The only hope for those huddled inside is to fight - tooth and nail, bullet and blade - for their lives. Otherwise, they’ll end up like the monsters’ other victims: bright pools of blood on glittering snow, screams lost in the vast mountains.

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.

Joe works at a facility that performs human experimentation. His work just followed him home. The government wanted to unlock hidden abilities in the human mind. They put subjects in extreme sensory deprivation. All the test subjects went violently insane. But the research continued. Today it has been perfected. Almost perfected.

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.

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.

In a boarded-up house on a dead-end street at the edge of the wild Washington woods lives a family of three. A teenage girl who isn’t allowed outside, not after last time. A man who drinks alone in front of his TV, trying to ignore the gaps in his memory. And a house cat who loves napping and reading the Bible. An unspeakable secret binds them together, but when a new neighbor moves in next door, what is buried out among the birch trees may come back to haunt them all.

High up on the windswept cliffs of Pale Peak, Faye and Felix celebrate their new engagement. But soon, a chorus of ghastly noises erupts from the nearby woods: the screams of animals, the cries of children, and the mad babble of a hundred mournful voices. A dark figure looms near the windows in the dead of night, whispering to Faye. As the weather turns deadly, Felix discovers that his terrified fiancée isn't just mumbling in her sleep—she's whispering back.

When Louise finds out her parents have died, she dreads going home. She doesn’t want to leave her daughter with her ex and fly to Charleston. She doesn’t want to deal with her family home, stuffed to the rafters with the remnants of her father’s academic career and her mother’s lifelong obsession with puppets and dolls. She doesn’t want to learn how to live without the two people who knew and loved her best in the world. Most of all, she doesn’t want to deal with her brother, Mark, who never left their hometown, gets fired from one job after another, and resents her success.

Judas Coyne is a collector of the macabre. But nothing he possesses is as unlikely or as dreadful as his latest discovery, a thing so terrible-strange, Jude can't help but reach for his wallet. For a thousand dollars, Jude will become the proud owner of a dead man's suit, said to be haunted by a restless spirit. But what UPS delivers to his door in a black heart-shaped box is no imaginary or metaphorical ghost. It's the real thing.

Grieving mother Magos cuts out a piece of her deceased eleven-year-old son Santiago's lung. Acting on fierce maternal instinct and the dubious logic of an old folktale, she nurtures the lung until it gains sentience, growing into the carnivorous little Monstrilio she keeps hidden within the walls of her family's decaying Mexico City estate. Eventually, Monstrilio begins to resemble the Santiago he once was, but his innate impulses—though curbed by his biological and chosen family's communal care—threaten to destroy this fragile second chance at life.

To eight-year-old Bela, her family is her world. There’s Mommy, Daddo, and Grandma Ruth. But there is also Other Mommy, a malevolent entity who asks her every day: “Can I go inside your heart?” When horrifying incidents around the house signal that Other Mommy is growing tired of asking Bela the question over and over, Bela understands that unless she says yes, her family will soon pay. Other Mommy is getting restless, stronger, bolder. Only the bonds of family can keep Bela safe, but other incidents show cracks in her parents’ marriage. The safety Bela relies on is about to unravel.

For nearly two decades, Jamie Warren has been running from darkness. He's haunted by a traumatic childhood and the guilt at having disappeared from his disabled brother's life. But then a series of unusual events reunites him with his estranged brother and their childhood friends, and none of them can deny the sense of fate that has seemingly drawn them back together. Nor can they deny the memories of that summer, so long ago—the strange magic taught to them by an even stranger man, and the terrible act that has followed them all into adulthood.

Muriel McAuley has lived in the Scottish fishing village of Witchaven all her life. She was born there, and she intends to die there. But when an overseas property developer threatens to evict the residents from their homes and raze Witchaven to the ground in the name of progress, all seems lost . . . until the day a mysterious fog bank creeps inland.