Consider me a convert to the cult of Georgette Heyer! These Old Shades is the second book I've read by her, and my new favorite. It's got a bit of everything -- the dashing, aristocratic hero, the waifish young girl with a mysterious identity, a long-buried scandal that's revealed in a truly marvelous scene, and lots of occasions to rub elbows with high society in all the best salons of Paris. The romance is rather delicious, and there's plenty of witty banter and silliness mixed in with the more dramatic deceptions and revenge schemes. 
 Can't wait to sample more GH!