I looked at the Kindle sample, and I got really cranky, because there were so many noticeable little mistakes and arrogances. I think this because I actually work on manuscripts, until recently in Duke Humfrey's library, so those who don't might well love it much more. Also the hero is irritating and the library staff a mean and rather snobbish misrepresentation. I thought it was a bit of a Mary Sue, tbh.