Lifestyle journalist Katrine escaped past traumas by moving to a coast renowned for seaside holidays and natural beauty. But when a vast hoard of human remains and prehistoric artifacts is discovered in nearby Brickburgh, a hideous shadow engulfs her life. Helene, a disillusioned lone parent, lost her brother, Lincoln, six years ago. Disturbing subterranean noises he recorded prior to vanishing, draw her to Brickburgh's caves. A site where early humans butchered each other across 60,000 years. Upon the walls, images of their nameless gods remain.

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.

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.

Clifford Island. When Willow Stone finds these words written on the floor of her deceased son’s bedroom, she’s perplexed. She’s never heard of it before, but soon learns it’s a tiny island off Wisconsin’s Door County peninsula, 200 miles from Willow’s home. Why would her son write this on his floor? Determined to find answers, Willow sets out for the island. After a few days on Clifford, Willow realizes: This place is not normal. Everyone seems to be stuck in a particular day in 1994.

The Ruins follows two American couples enjoying a pleasant, lazy beach holiday together in Mexico. On an impulse, they go off with newfound friends in search of one of their group, the young German who, in pursuit of a girl, has headed for the remote Mayan ruins, site of a fabled archeological dig.

Claire Kovalik is days away from being unemployed—made obsolete—when her beacon repair crew picks up a strange distress signal. With nothing to lose and no desire to return to Earth, Claire and her team decide to investigate.

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.

Ana and Reid needed a lucky break. The horrifically complicated birth of their first child has left Ana paralyzed, bitter, and struggling: with mobility, with her relationship with Reid, with resentment for her baby. That's about to change with the words any New Yorker would love to hear—affordable housing lottery. They've won an apartment in the Deptford, one of Manhattan's most revered buildings. Reid dismisses disturbing events and Ana’s deep unease and paranoia as the price of living in New York—people are odd—but he can't explain the needle-like bite marks on the baby.

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.

The red night of bells heralds global catastrophe. Annihilation on a biblical scale. Seeing the morning is no blessing. The handful of scattered survivors are confronted by blood-red skies and an infestation of predatory horrors that never originated on earth. An occupying force intent on erasing the remnants of animal life from the planet. Across the deserted landscapes of England, bereft of infrastructure and society, the overlooked can either hide or try to outrun the infernal hunting terrors. Until a rumour emerges claiming that the sea may offer an escape.