"Malls and parking garages may want to start padlocking their creepy tunnels now, because everyone’s going to want in when this comes out."—Emma Keates, A.V. Club
Backrooms appear in the back of a furniture store and seem to manifest out of thin air before going on near-endlessly. Clark (Chiwetel Ejiofor) is determined to prove to this therapist (Renate Reinsve) that the Backrooms do in fact exist.