Gothic attempt by Heyer. Secondary characters are fun, but Kate & Phillip know each other far too briefly and interact so rarely that their marriage proposal seems odd and rushed. CRAZY evil aunt. Poor crazy son. Eeek. Hits all the Gothic notes. Fun as an example of the genre, but a far cry from Heyer's finest. It is not even all that intriguing a story apart from the Gothic trappings.
And, yes, the aunt was very "kind' but Kate, there comes a point where you really don't owe them!