Author, English journalist, employee of the London Sunday Times F. Knightley, objectively writes about the Soviet intelligence officer Kim Philby. The book describes the acute moments in the intelligence activities of Philby, who deliberately, based on his convictions, went to cooperate with Soviet intelligence. Philby's ability to find optimal solutions in difficult, life-threatening situations is shown. Many pages are devoted to Philby's personal life, the memories of his colleagues at work at the headquarters of the ICU and the CIA, at the British intelligence residency in Istanbul and Beirut are interesting.