Legendary spy, assassin, and art restorer Gabriel Allon is back and out for revenge – determined to hunt down the world’s most dangerous terrorist, a shadowy ISIS mastermind known only as Saladin. Four months after the deadliest attack on the American homeland since 9/11, terrorists leave a trail of carnage through London’s West End. The attack is a brilliant feat of planning and secrecy, but with one loose thread: the French-Moroccan street criminal and ISIS operative who supplied the combat...