Awhile back I posted a few books from my Bookmarks Magazine that sounded interesting to me. One of them was the Cliff Janeway series by John Dunning. "Booked to Die" is the first in the series about "a tough, book-loving homicide detective". Based on my recommendation, my mom read the whole series. She said the first three books were good and interesting. They talked quite a bit about the technical side of book collecting. And although the last couple were still good, there weren't quite as good because they weren't focused as much on the book part of the series.
I haven't read any of these yet, but hope to start the first one sometime in the near future. It's on my must-read list. :-)
I'm about 50 pages into The Shadow of the Wind and am enjoying it so far. I'll post a full review when I'm finished!