Supernatural thriller about 5 people stuck in an elevator in a Philadelphia high-rise

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A cop traumatized by the accidental death of his wife and son a few years earlier tries to free 5 people – a claustrophobic security guard, a mattress salesmen, an elderly woman, an ex-marine and a conservative yuppie – stuck in an elevator on the 35th floor of a Philadelphia high-rise. Via radio contact, he slowly finds out each one has a troubled past, even as he powerlessly and inexplicably has a hand in their deaths. In the face of this tragedy taking place on their security monitors, one of the building's guards comes to the conclusion that the devil is behind it all and that he's posing as one of the 5 people...

Thriller that proves ideas and talent are enough to make a good B movie, without stars or an obscene budget rivaling the GNP of a small country, and without wannabe artistic ambitions. A success!