My brother gave me a copy of Mr. Penumbra's 24-Hour Bookstore by Robin Sloan for Christmas and I liked it a lot. If you dig books, bookstores, google, knitting, secret societies (Umberto Eco, Dan Brown kind of stuff), it's a blast (far less dense than Eco, far more plausible than Brown), and it's set in our world (or maybe 15 minutes into the future). The writing is great, too, with smart characters, and plot and character elements that get mentioned early on, and which later get used as keys bits of the plot's resolution. CBC Radio did an interview with the author.
Aloha,
Brad