All Rob wanted was a normal life. She almost got it, too: a husband, two kids, a nice house in the suburbs. But Rob fears for her oldest daughter, Callie, who collects tiny bones and whispers to imaginary friends. Rob sees a darkness in Callie, one that reminds her too much of the family she left behind. She decides to take Callie back to her childhood home, to Sundial, deep in the Mojave Desert. And there she will have to make a terrible choice.

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.

Mary is a quiet middle-aged woman doing her best to blend into the background. Unremarkable. Invisible. Unknown even to herself. But lately, things have been changing inside Mary. Along with the hot flashes and body aches, she can’t look in a mirror without passing out, and the voices in her head have been urging her to do unspeakable things. Fired from her job in New York, she moves back to her hometown hoping to reconnect with her past and inner self. What she finds instead are visions of terrifying mutilated specters that come with increasing regularity.

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.

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.

Gracetown, Florida. June 1950. Twelve-year-old Robbie Stephens, Jr., is sentenced to six months at the Gracetown School for Boys, a reformatory, for kicking the son of the largest landowner in town in defense of his older sister, Gloria. So begins Robbie’s journey further into the terrors of the Jim Crow South and the very real horror of the school they call The Reformatory.

With nothing but the clothes on his back - and something horrific snapping at his heels - Jack Winter fled his rural Georgia home when he was just a boy. Watching the world he knew vanish in a trucker’s rearview mirror, he thought he was leaving an unspeakable nightmare behind forever. Now, years later, the bright new future he’s built suddenly turns pitch black, as something fiendishly familiar looms dead ahead. Surviving a violent car crash seems like a miracle for Jack’s family, but Jack knows there’s nothing divine about it.

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.

When Mouse’s dad asks her to clean out her dead grandmother's house, she says yes. After all, how bad could it be? Answer: pretty bad. Grandma was a hoarder, and her house is stuffed with useless rubbish. That would be horrific enough, but there’s more - Mouse stumbles across her step-grandfather’s journal, which at first seems to be filled with nonsensical rants...until Mouse encounters some of the terrifying things he described for herself.

It’s the house of their dreams. Former marine Harry and his wife, Sasha, have packed up their life and their golden retriever, Dash, and fled the corporate rat race to live off the land in rural Idaho. Their breathtaking new home sits on more than forty acres of meadow, aspen trees, and pine forest in the Teton Valley. Even if their friends and family think it’s a strange choice for an up-and-coming pair of urban professionals, Harry and Sasha couldn’t be happier about the future they’re building, all by their lonesome.

Ever since their on-again, off-again college romance, Erin hasn’t been able to set a single boundary with charismatic but reckless Silas, who has been chasing the next big high since graduation. When he texts her to spring him out of rehab, she knows enough is enough. She is ready to start a career, make new friends, and meet a great guy—even if that means cutting Silas off. But when Silas turns up dead from an overdose, Erin’s world falls apart.

Meghan, Brecia, and Skye have just one thing in common. They were all murdered by the same man. He hunted them online, masquerading as an eligible bachelor. Then he played the perfect gentleman, a thick layer of charm and a thousand-watt smile hiding the fact that his first dates end in shallow graves. He’s gotten away with murder three times now.

A strange plague called the "Gets" is decimating humanity on a global scale. It causes people to forget - small things at first, like where they left their keys... then the not-so-small things like how to drive, or the letters of the alphabet. Then their bodies forget how to function involuntarily - and there is no cure. But now, far below the surface of the Pacific Ocean, deep in the Marianas Trench, an heretofore unknown substance hailed as "ambrosia" has been discovered - a universal healer, from initial reports.

Money's tight and their new home is a fixer-upper. Deep in rural South West England, with an ancient wood at the foot of the garden, Tom and his family are miles from anywhere and anyone familiar. His wife, Fiona, was never convinced that buying the money-pit at auction was a good idea. Not least because the previous owner committed suicide. Though no one can explain why.

In an isolated chateau, as far north as north goes, the baron’s doctor has died. The doctor’s replacement has a mystery to solve: discovering how the Institute lost track of one of its many bodies. For hundreds of years the Interprovincial Medical Institute has grown by taking root in young minds and shaping them into doctors, replacing every human practitioner of medicine. The Institute is here to help humanity, to cure and to cut, to cradle and protect the species from the apocalyptic horrors their ancestors unleashed.