I didn't have time to read An Evil Guest twice, which is what's usually needed for one of Wolfe's books, so I cheated and went online to look up a puzzling question. Yep, I'd missed quite a few details, details which put a different light on Cassie's nature.
I didn't like this one quite as much as others. The review I read suggested that might be because Wolfe was trying for some humor here and there, and not quite succeeding. Now that I think of it, yep, that sounds right. Irony he can do, but I haven't read anything I'd call funny. Werewolves and R'lyeh and aliens with unclear technologies and a mysterious billionaire and a theater musical and a wizard who can make you a star, and does. Fun.