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Since it became independent in 1929, Vatican City has been the world’s smallest state. Every evening the gates close, leaving behind only 500 permanent residents. I once spent a week behind the walls as a guest in the Santa Marta hostel where the Pope lives; at night the deserted courtyards are thrillingly spooky. But it’s during the day that they echo with the footsteps of secret agents. The Vatican has been teeming with spies since popes started living on this 100-acre plot of land west of the Tiber when they returned from Avignon in 1377. In the 20th century it entered a new era of espionage when the papacy was

The best espionage novels cater to our fantasies while still persuading us of the authenticity of their worlds. Of the titles published this year, two stand out in the field, and each author understands that, in fiction, veracity is not the same as authenticity. In Hemingway’s words: ‘All good novels have one thing in common. They are truer than if they had really happened.’ An extended chase, beginning in Siberia, is a kind of Russian version of The Thirty-Nine Steps White Fox (Bantam, £18.99) is the concluding volume of a trilogy of thrillers by Owen Matthews, one of the best of many western writers on Russia. It can happily be