One of the classic 'innocent abroad' spy series. Country doctor Jason Love, MD, is propelled into the world of espionage by virtue of his war service and martial arts expertise, and never quite gets used to his role as secret agent despite filling 4 books with his adventures.
Passport to Oblivion (filmed as 'Where the Spies Are' with David Niven)
Passport in Suspense
Passport to Peril
Passport for a Pilgrim
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