I have loved some of Ross King's non-fiction books, including
Brunelleschi's Dome,
Michelangelo And The Pope's Ceiling, and
Leonardo and the Last Supper. But I had no idea he had written two historical mystery/suspense titles:
Ex-Libris and
Domino. Now
Ex-Libris is on sale at Kindle UK for £1.99. This one is going to start off near the top of my TBR pile. (I can't find it in the US in e-book at all...)
Kindle UK:
https://www.amazon.co.uk/dp/B00CLBPTHK
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B00CLBPTHK