Kindle for PC
Kindle for PC is a very capable, full-featured and free e-book reader with great extras.
If there's a book you can't put down, why restrict yourself to a physical book? Start reading e-books instead. Download e-book software such as Amazon's free Kindle for PC, and then start reading books on your computer. If the boss stops by, just click over to another open app and pretend you were working all along.
Note: This link takes you to the vendor's site, where you can download the latest version of the software.