Inferno

The mute, crippled Dr. Varelli (Feodor Chaliapin) is the architect of the apartment building designed for the 2nd witch, Mother of Darkness, who happens to be his nurse and keeper (Veronica Lazar). As with Suspira, the whole building is consumed by flames and burns down. Only Mark (Leigh McCloskey) survives. The fate of the Mother of Darkness is not clear.
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