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In the ever useful The Len Deighton Companion by Edward Milward-Oliver in 1987, he writes this about the entry 'Vienna':
"Vienna. Although no longer the capital of an empire, Vienna is unchanging. Sachers is still serving the Sacher Torte cake it served at the turn of the century - an era notably depicted in the beginning of Winter, in which we find Veronica Winter in the first stages of labour as her husband is summoned to a meeting with the secret police chief, Count Kupka. Thirty-eight years later, Paul Winter returns to the city of his birth, to find the restaurants and shops filled with German tourists who've arrived within hours of the German Army crossing the front to enforce the Nazi Anschluss."
Right throughout espionage literature, Vienna's always had a central spot as a location for intrigue, threats, exchanges and murder. Worth a read.