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469 p On cover: A Gabriel Allon thriller Summary: Gabriel Allon's idyllic world is once again thrown into turmoil with shocking news from London that a defector and former Russian intelligence officer Grigori Bulganov, who saved Gabriel's life in Moscow, has vanished without a trace. British intelligence is sure he was a double agent all along, but Gabriel knows better. He also knows he made a promise that leads him to a deadly duel of nerve and wits with an old foe, the murderous Russian oligarch and arms dealer Ivan Kharkov