In Hitler's Man in Havana, Prof. Schoonover, author of quite a number of books and articles on Latin American history, tells several stories, all interwoven.  He addresses the largely untold tale of Axis espionage and ambition in Latin America , real if limited, the U.S. 's efforts to counter those efforts, and use them to increase its influence in the region, and how these were affected by and affected Latin American local politics and nationalism. 

And then there's Heinz Lüning, a most inept and unfortunate spy, whom Schoonover uses as the lens through which he examines these varied stories.