Frederica, The Reluctant Widow, and The Talisman Ring
These were the other Heyers I read. They were fun, predictable (or on the opposite, unbelievable), and fluffy. And they certainly felt like historical fiction despite all the research Heyer did. I'm not saying that she's not a good author, or didn't write well-researched books, but after trying four, I can't say they were much more than fluff. But I'll remember Heyer if I'm air-conditioner-less next summer.