From a former spy comes an electrifying novel about the mystery, paranoia and ruthlessness of the secretive world of British espionage 'Wonderfully entertaining' John Banville, author of Booker Prize-winning The Sea 'Wolff is the new maestro' Simon Sebag Montefiore The Head of British Intelligence is having a bad day. Only six months off retirement and Sir William Rentoul is wondering if he'll make it that far, what with the sudden descent of a brain fog dense enough to turn every day into a ser