The Untouchable by John Banville

An aging art historian and former British intelligence officer, newly unmasked as a Soviet mole, delivers a coolly measured confession that retraces his Cambridge recruitment, wartime intrigues, and ascent within the British establishment. As he sifts through fraught friendships, aesthetic obsessions, clandestine desires, and calculated betrayals, he probes the slippery boundary between truth and performance. The result is a taut self-portrait of duplicity and longing in which memory, loyalty, and identity prove seductively unreliable.

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