Dave and his four-year-old, Jacob, find a circus tent in the woods behind their house. A strange voice invites them through the dark doorway. When they refuse, the tent swallows them.

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. 

A virus tears across the globe, transforming its victims in nightmarish ways. As the world collapses, dark forces pull a small group of women together. Erin, once quiet and closeted, acquires an appetite for a woman and her brain. Why does forbidden fruit taste so good? Savannah, a professional BDSM switch, discovers a new turn-on: committing brutal murders for her eldritch masters. Mareva, plagued with chronic tumors, is too horrified to acknowledge her divine role in the coming apocalypse, and as her growths multiply, so too does her desperation.

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. 

Struggling with money, raising a child alone, and fleeing a volatile ex, Jess McMachen accepts a job caring for an elderly patient. Flo Gardner–a disturbed shut-in and invalid. But if Jess can hold this job down, she and her daughter, Izzy, can begin a new life. Flo's vast home, Nerthus House, may resemble a stately vicarage in an idyllic village, but the labyrinthine interior is a dark, cluttered warren filled with pagan artefacts.