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The Spies of Warsaw: A Novel (original 2008; edition 2008)
by Alan Furst
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Wikipedia in English
Amazon.com Product Description (ISBN 0812977378, Paperback)War is coming to Europe. French and German intelligence operatives are locked in a life-and-death struggle on the espionage battlefield. At the French embassy, in Warsaw, the new military attaché, Colonel Jean-François Mercier, a decorated hero of the 1914 war, is drawn into a world of abduction, betrayal, and intrigue in the diplomatic salons and back alleys of the city. At the same time, the handsome aristocrat finds himself in a passionate love affair with a Parisian woman of Polish heritage, a lawyer for the League of Nations. Risking his life, Colonel Mercier must work in the shadows, amid an extraordinary cast of venal characters, some known to Mercier as spies, some never to be revealed.
(retrieved from Amazon Mon, 30 Sep 2013 14:05:39 -0400)
A French aristocrat working as a military attache at the French embassy in Warsaw in 1937 tries to gather information for Poland and France, wondering what move Germany will make next. Romantic sparks fly between the French aristocrat's cousin and a Franco-Polish woman who works as a lawyer for The League of Nations, all against the backdrop of Hitler's gathering war.
(summary from another edition)