Mr. Penumbra's 24-Hour Bookstore

This book snuck up on me. All I knew about it before I read it was that it was about a bookstore, and that was going to be interesting enough. But the story ended up reminding me of a combination of Snow Crash, The Circle, and The Da Vinci Code, which means I definitely couldn't go to sleep until I finished it. One aspect of annoyance - the many references to Google may be interpreted as either an endorsement or a warning.