• An exemplary biography... it is full of perceptive intimacies and plenty of tradecraft, subterfuge, deception and revelation. I cannot think of a better biography of a spy chief.

    Richard Davenport-Hines, The Spectator
  • a frank and clear-eyed, if affectionate, biography of a great public servant, cruelly traduced

    Matthew Parris, Spectator, Books of the Year 2016
  • An intriguing portrait of a brilliant man

    Mail on Sunday
  • Gripping and candid.

    The Times
  • A welcome biography of a man able to combine warm family and personal relationships with hard-headed intellectual analysis, taking the cold decisions needed to succeed in the most unaccountable and secret of government agencies.

    Richard Norton-Taylor, Guardian

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