Mr. Penumbra's 24-Hour Bookstore

The first chapter of Robin Sloan's Mr. Penumbra's 24-Hour Bookstore is so intriguing I splurged and bought a copy for my Kindle.  I loved the premise.  Of course I did, a 24-hour bookstore is one of my dreams. While it was interesting at first, the excitement waned and I found myself correctly predicting the end (something I can rarely do) but the foreshadowing was pretty heavy handed. My high hopes for this book were dashed around the midpoint.