The Mark Of The Assassin, by Daniel Silva

So interesting to read this, Silva's second book, after reading all the Gabriel Allon books (which came later) first. In retrospect, this book reads like a practice session for the Allon series. There's a character (the assassin) who shares a remarkable number of characteristics with Allon, though some differences, and an earlier incarnation of Ari Shamron. Adrian Carter is present as well. Really interesting.