Kris Frieswick. Released 2nd April 2019 by Post Hill press, it's 432 pages and available in hardcover, audio, and ebook formats.
I am a big time bibliophile. I will read pretty much anything that features books or librarians (cats optional). I also love mysteries. This book ticked all the boxes for me, but I still found something lacking. Possibly the addition of an Arthurian legend to the mix was a little too far toward the 'National Treasure'/'Indiana Jones'/'Da Vinci Code'. For readers looking for rollicking yarns along those lines, this could potentially be a winner.
The book is fairly well written, but there were several times I found myself yanked out of the story by 'gotcha' moments that were so over the top unbelievable (and telegraphed beforehand) that it was a while before I re-engaged with the story. For readers who dislike strong language, this book has a fair bit. There are also some mentions of sex.
The ending implies a follow up book. It does have a resolution, but the epilogue clearly indicates that it's not a full stop.
Three and a half stars. Rounded up because there are millions of people who are Dan Brown fans, and this book read (to me) very much in the same vein.
Disclosure: I received an ARC at no cost from the author/publisher for review purposes.