Spy fiction, or ‘spy-fi’, has its specialist practitioners, but big literary names have also turned to the genre for their own varied purposes. Graham Greene’s The Quiet American springs to mind, as does Norman Mailer’s Harlot’s Ghost, a fictionalised study of the CIA. But where these two literary spy thrillers struggle to shed the suspicion of political motivation, William Boyd’s Restless instead does what all his novels do. It informs us a little about what humans are like.

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