This is the grimy antidote to Bond where the lead character has the Burnley accent. Deighton's espionage world is full of crooks rather than spys on both sides. He portrays a world where the driving force is not a simple Left/Right ideology but rather out and out greed.
It has a Chandleresque prose style fitted into a UK setting; actually a very London-centric setting.It has an odd feeling of being written as a reaction to something and I can only assume it is Ian Fleming's stuff. It is very anti-Establishment and early 60's referring to Harry as 'he could have been a John Osborne hero'. This feeling goes with a general world weariness.
He gives a knowing wink at the real-life UK traitors but unfortunately he didn't quite know the whole story in 1962. This is not Mr Deighton's fault and does not weaken his valid premise that the spy world may have more to it than duffing up the Russkies.
Without giving away the plot there is also some prescient stuff on brain-washing and industrial espionage for which the author deserves credit.
Enjoyed this more than I expected. It has a curiosity value to see early 60's political attitudes, it offers a different kind of espionage raison d'etre typified by the 'Ipcress' concept and it keeps you turning the pages.