I ordered These Old Shades from Amazon because I'd recently read and reviewed Georgette Heyer by Jennifer Kloester. I enjoyed the biography more than the novel, though.
My experience with Heyer has been mixed. I've thoroughly enjoyed some, while others have OK.
These Old Shades is an early Heyer and a disappointment. The characters are not terribly appealing, although I admit to liking the Duke better as the novel progressed, Leonie remains insipid throughout. Plot is pretty predictable, but kept me reading.
Although this is a favorite for many Heyer fans, I didn't much care for it.
It does, however, provide a good example of some of Heyer's earliest work, and that is always interesting. Authors develop in so many ways as they continue to write, and Heyer published over 50 novels throughout her long career.
Historical Fiction. Original publ. 1926; republished 2009. 384 pages.