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A young man checks into a secluded hotel room, expecting an ordinary night. But when a series of unsettling, anonymous phone calls begins and a terrifying, otherworldly entity appears in the desolate parking lot below, the boundaries of reality start to warp. Trapped in a claustrophobic, seemingly endless labyrinth of shifting corridors and malfunctioning elevators, he must escape a shifting nightmare where every door leads back to where he started.