Penguin Books Defector

Gabriel Allon took down the world's most dangerous man. He made just one mistake. Leaving him alive ...Spy turned art restorer Gabriel Allon is in Umbria, when shocking news arrives from London. A Russian defector who saved his life has vanished without a trace. British Intelligence suspect he was a double agent, but Allon knows better. Soon he finds himself in a deadly duel of wits with a murderous Russian arms dealer as he bargains for his friend's life. Criss-crossing Europe at breakneck pace and culminating in a heart-stopping climax in the freezing birch forests of Russia, "The Defector" is a searing and bloody tale of courage and vengeance...