Former cop Phil Lodge takes a new job as a superintendent in an exclusive Manhattan high-rise apartment building, but when the tenants begin to disappear with alarming frequency, he fears a sadistic murderer may be roaming the corridors.

Phil's prime suspect is the building's unsettling maintenance man, Walter, who lurks among the cavernous bowels of the apartment block. Although Walter readily provides the former cop with disturbing advice, Phil must decide whether he is simply trying to throw him off the scent. As it becomes clear that every resident has something to hide, is Phil right to trust a stranger with a key to his front door?

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