Ok, try getting some books from Alan Furst, start off with his first book called Night Soldiers.If you like espionage type thrillers, set in WW2 or that genre, you'll like him.Lots are set in occupied Paris.Or check out one of his other book, Kingdom of Shadows.That may have been his first, not sure.I'm reading the Polish Officer now, its very good, and not long.
You could also try Buchan's other books in 39 Steps trilogy, called Mr Standfast and Greenmantle.