Erebus centers around the Gorham House, a mysterious old hotel with a torrid history of violent occult activity, as well as supernatural, and paranormal. Seeking to document the hotel for a new book, Samantha and Benny, journey to investigate the hotel, learning of its terrifying history along the way by relaying three horrifying tales of its previous owners.

A pair of friends from Boston kick off their New Year by making a pact to murder the people who have mistreated them in this darkly comic thriller. When the slaughter starts, their ex-boyfriends will wish they'd been faithful.