These Old Shades
One of the books on my reading list for 2009 was a novel by Georgette Heyer, These Old Shades.
Unlike previous novels by Heyer that I've read, this one was set in France, rather than England. It involves a dissipated duke, intent on revenge, and a case of mistaken - or possibly, changed - identity. I found it somewhat similar to some of Shakespeare's comedies with touch of Pygmalion.
Good diversionary reading for summer.