Gabriel Allon is recalled again from civilian life to investigate a possible terrorist plot by members of Al-Qaeda to attack the Vatican.

"G.P. Putnam's Sons.". Series order: 1."The kill artist" -- 2."The English assassin" -- 3."The confessor" -- 4."A death in Vienna" -- 5."Prince of fire" -- 6."The messenger" -- 7."The secret servant" -- 8."Moscow rules" -- 9."The defector" -- 10."The Rembrant affair" -- 11. "Portrait of a spy".