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Where else is there to hole up besides within the buildings?
[He agreed she had to be somewhere she could last a few hours, but there had to be plenty of shelters beneath ground. Several of the houses he's searched had below ground basements that would protect people nicely. Wine cellars and other rooms that were completely enclosed.]
I wouldn't be surprised if some of these places had passageways or hidden rooms. They aren't too hard to find if you know what you are looking for.
[At least they were common to find while hunting vampires in his world. Some more elaborate than others.]