At a young couple's housewarming party, an unspeakably demonic entity breaches a Medium, creating chaos and terrifying its attendees. After the party ends, this entity begins stalking guests; trying to defend against it while not knowing whom they can trust due to shapeshifting capabilities of this Demonic being; they attempt to fight back but soon find out they must fight against one after the next until eventually, it starts killing off everyone present one by one!