I’m only going to attempt a vague outline of this story, because if I tried to sketch the high level of the plots that actually culminate at the end, I’d both take too long, and end up being confusing.
Lord Spenborough was on his second wife, as his first marriage resulted only in a daughter – Lady Serena. The new Lady Spenborough is actually younger than her step-daughter, but they get along well, which is fortunate when Lord Spenborough dies, and the two of them are thrown together. Rather than spend time in the Dower House near the well meaning but irritating cousin who’s inherited the title (well, really, his wife, who’s a little too fond of her new title), they decide to take up residence in Bath.
Oh, and Serena was once engaged to the Marquis of Rotherham, a particular friend of her father’s, but called it all off once she realized they’d spend all their time arguing. So who does her father list as the guardian of her fortune? Rotherham, of course. You can obviously see where this is going, despite a whole bunch of other plot twists I am not even going to attempt to catalog. I’ve called some of Heyer’s book madcap before. This one brings new definition to the term.