The Double Agent is a 1966 spy thriller novel by the British writer John Bingham.West p.54 It features the fictional head of British intelligence Ducane, who recurs in several of the author's novels.Reilly p.122 It was a runner-up for the Gold Dagger award.
References
Bibliography Reilly, John M. Twentieth Century Crime & Mystery Writers. Springer, 2015. West, Nigel. The A to Z of British Intelligence. Scarecrow Press, 2009.