St. Rosaria was an "exorsister", an agent of the global alliance of evil-banishers, who was tracing the origins of "demon porn".
This adult video, whose viewers disappear completely without a trace, was apparently created by "defensevils" as an attack on humanity.
Rosaria had located its transmission point, a dilapidated hospital. She went there.
But the hospital was, like the demon porn, a tactical ploy of the defensevils. They used it as headquarters, and as a lure for such hapless do-gooders as her.