This was a completely accidental find -- I was searching NEIBORS for books by an author with the last name of Hoover, and this came up in the search. My NaNoWriMo novel is about a librarian, and the idea of book thieves totally caught my attention.
I'm not a huge reader of nonfiction, but this read more like a novel in some ways, and I was just fascinated. The thief in question is just so outrageous, he would say completely contradictory things and not seem to be aware that he made no sense to others, his worldview, and view of himself were just completely wacko.
I really enjoyed this, and it has given me some food for thought for my own writing.