Passport To Peril

To me the four big names in espionage fiction are John Buchan, Eric Ambler, Graham Greene and John le Carre. Each changed the form profoundly. Passport To Peril, the latest book from Hard Case Crime, was first published in 1950 and contains set-pieces borrowed not only from Buchan and Ambler but also Alfred Hitchcock. The only influence I don't see here is Greene. In some respects it's a compendium of espionage tropes that filled spy novels from the time of Buchan all the way up to the Cold War,