Tom and Janet have been happily married for years. But a visit from a mysterious stranger leads to a dead body, a lot of questions, and a tense couples' trip with friends who may not actually be friends at all.

Two scientists investigate the root of environmental changes and strange animal behavior at a remote site where a cult committed atrocities. The isolated location, the unraveling of their relationship, and the biome itself begin to lead them down a path of doom where primeval forces threaten to consume them. An adaptation of Laird Barron's short story "–30–".

The film follows Jeremiah, a teenage boy haunted by something entirely unnatural. As he becomes increasingly paranoid, he begins to question the decisions he's been making throughout his life.