Just as troubled medium Roman Mercer prepares to leave the small town of Port Moore, an earthquake strikes the Alaskan island and awakens a supernatural force bent on destruction.

As churchgoers flourish in numbers, Reverend Dan soothes the anxieties of the townspeople. When the hauntings escalate to a possession of a young boy, Dan wrestles with the thought of performing an unsanctioned exorcism.

The town leans on skeptical and steadfast handyman Doug after Port Moore's social structure begins to collapse, but when Doug's dead daughter persuades Roman to deliver a message, Doug's well being rapidly deteriorates.

As Val organizes a civil defense force to protect the town, her daughter Abigail goes missing; Jimmy leads the charge to find the girl, employing Roman's medium skills and anyone who's willing to set foot in the forest on the outskirts of town.

A power outage sends Port Moore into a tailspin and somehow makes the ghosts stronger, prompting Roman, Jimmy, Landis and Doug to trek up to the dam to get the power back, but a long-buried town secret threatens to tear the group apart.

With his body in critical condition, Jimmy's spirit becomes trapped in the nightmarish ghost realm; Roman pursues Dan, looking for answers about his mother's death.

Lambda's attempts to experiment on their confiscated pod go awry when a grotesque Norm emerges from the ghost vessel and unleashes havoc on anything in his path; a monster hunt begins.

While the ghosts build a resistance against Roman, Port Moore survivors draw straws in preparation for their final battle, a quest to connect the two halves of the artifact in the ghost realm.