Ken Follett, Eye of the Needle, 1978

Eye of the Needle is a spy thriller novel written by Welsh author Ken Follett. It was originally published in 1978 by the Penguin Group under the title Storm Island. This novel was Follett's first successful, best-selling effort as a novelist, and it earned him the 1979 Edgar Award for Best Novel from the Mystery Writers of America. The revised title is an allusion to the "eye of a needle" aphorism. [Source]

His code name was “The Needle.” He was a German aristocrat of extraordinary intelligence—a master spy with a legacy of violence in his blood, and the object of the most desperate manhunt in history.

But his fate lay in the hands of a young and vulnerable English woman, whose loyalty, if swayed, would assure his freedom—and win the war for the Nazis. [Source]