Four strangers -- Astrid, Arlo, Travis and Bill -- wake up in a house with no furniture, and no exits. Bill starts to realize that the house is not what it seems; that there is something "underneath."
A new arrival in the house at the end of universe, Theresa, claims to be a "psychic astronaut." Astrid, meanwhile, is haunted by a song she once wrote, and her past.
When the house's food supply runs low, Theresa orchestrates a seance to reach the forces behind the denizens' captivity. A mirror materializes and causes Astrid and the others to act strangely. Bill sees a vision of his own funeral.
A sinister psychic astronaut, Sange, appears in the house in search of "The Draftsman." Bill reveals a secret about the house at the end of the universe. Arlo cracks the house's access code.
With the house activated, the Lar, Vitality, possesses Theresa to speak to the denizens. Travis reveals that he is living in an individual time loop. The denizens open the house's front door.