Eh. Sweeney St. George is a pretty forgettable protaganist. Like the other book, I didn't really care about the characters or the mystery. It was just the information about gravestone art that kept me reading. (In Mansions of the Dead, it was the mourning jewelry). It would be nice of someone like Sarah Vowell would write a book about death-art. (I'm sure that there's an actual term, but I'm tired, it's early, so "death-art" it is...)
If anyone can think of a great book that falls into this realm, let me know. It can be fiction, non-fiction, whatever. I find it fascinating enough that I'll apparently even read crappy mysteries just for little tidbits.