This was an excellent story! A mix of Dan Brown's Robert Langdon series and Robert Harris' Conclave. As for the timing of this book's release considering the new Pope's just been elected, either the author writes really fast or it was a lucky coincidence! I loved this. Plenty of action and POV's, from the delay of seeing the first smoke after the start of the conclave, the disappearance of the cardinals from the locked Sistine Chapel, the various authorities trying to track where they went, through to the thrilling conclusion. I also enjoyed the bit of history about the Cathars. Well worth reading.
Thanks to Netgalley, Book Whisperer, and Glenn Cooper for the free ARC. All opinions are my own.

After the sudden death of Pope John XXIV the cardinals were brought to the Vatican to form a conclave to vote for his successor.
While the cardinals were locked in the Sistine Chapel during the conclave the Vatican staff began to worry that there had been no smoke from the chimney after the vote.
When they opened the door they found that all one hundred and eighteen cardinals had vanished.
A thriller about the workings of the Catholic Church and the way it is perceived by some in this modern world.
Thank you to NetGalley and Book Whisperer for my e-copy in exchange for an honest review.