If the 1940s count (I hope they do!), I can recommend
December 6 by Martin Cruz Smith, the same author who wrote
Gorky Park.
December 6 has been overlooked but I think it's a great story that gets inside Imperial Japan on the eve of Pearl Harbor through the eyes of an American expat with one foot in both cultures. The story has shades of Casablanca:
http://www.amazon.com/December-6-ebo...1164444&sr=1-1
Also, like Slowrain mentioned above, Alan Furst's espionage novels are always good for great historical and character detail without overdoing it (usually).
Steve