The film focuses on 18-year-old Alex, who has been a fan of the Arthur fantasy film series since he was a child. When his close-knit group of friends surprises him with a trip to an abandoned house where the film was shot, they unwittingly walk headlong into a twisted, mortal trap. What was once a childhood dream soon turns into a very real nightmare for Alex and his friends as they struggle to escape the dark and treacherous world that lies beyond the film's world.