This book started out pretty strong, but really picked up the pace at the end. It takes place 6 or so years after a terrible (fictitious) terrorist incident in Vienna in a restaurant in hoity toity Carmel, California. There, Henry Pelham, who has been tasked with determining if there were a mole in the Vienna CIA office during the incident, interviews Celia Harrison, who had been his lover when the incident occurred, but who retired right after the incident, married a much-older very rich (obviously) man, and had 2 children with him. So this is both a personal and professional reunion.
I don't really want to say much more. If you like thrillers that are more intellectual than action, this one if for you. I figured out the very first layer, more or less, pretty early on, but there were twists upon twists and I did not figure all of them out right away. By the time I realized what was going on, I was glued to the book and couldn't wait to read to the end.
If anyone reads this, please answer the questions in the spoiler.