I'll nominate 'Eye of the Needle' by Ken Follet. I bought this a while back as a kindle deal of the day purchase and have yet to get around to reading it. From Amazon:
Quote:
is 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. . . .
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It might be borderline for a mystery, but I found it in a list of best mystery books.