This, the 9th in the Gabriel Allon series, begins six months after the dramatic conclusion of Moscow Rules, Gabriel has returned to Italy to resume his honeymoon with his new wife, Chiara, and to restore a seventeenth-century altarpiece for the Vatican. However, his life is turned into turmoil by the disappearance of the defector and former Russian intelligence officer Grigori Bulganov. The spy, who saved Gabriel's life in Moscow, has vanished without a trace. British intelligence considers him a double agent all, but Gabriel is not so sure. He also knows he made a promise to Grigori .....that he wouldn't end up in an unmarked grave. Daniel Silva weaves a great plot that you can't put down. A fine page turner!!