3.5 stars. If I wanted a quick way to describe this book, it would likely be "Harry Potter-ish". I really liked the strong female protagonist and the eccentric cast of supporting characters. The bibliocentric concept was really fun (the author's love of books and Sherlock Holmes was obvious). Finally, the action came fast and furious. In fact, it was such a page-turner that I actually felt exhausted by the time I finished the last page. This was great escapist fiction. I have already put myself on hold for the next title in the series.