Ida and Albin are a happy couple. They set off to a cabin in the vast Swedish woodlands to have a fun holiday with their friends. But under the floorboards waits an evil from Sweden's dark past.

Cora is set decades into the future, after a deadly mist has covered earth, effectively wiping out most of humanity. Now, we follow Cora, a woman working for an organization trying to reverse the effects of the apocalypse.

Robbie embarks on a dangerous quest to contact his deceased girlfriend through a ritual that summons the dead. He heads to an abandoned house with a group of young people to perform the "Red Book Ritual." But during the summoning, supernatural forces awaken. Now they must face ancient horrors to survive.

Ida and Albin are a happy couple. They set off to a cabin in the vast Swedish woodlands to have a fun holiday with their friends. But under the floorboards is an evil that waits to be unleashed.