I was thinking last night about some of my favourite books and realised that there's a common theme - the book is set in the present day but the narrator or main character is researching some sort of family or past mystery usually set in Victorian or later times.
Examples of the kind of book I'm thinking of are Asta's Book and the Blood Doctor by Barbara Vine and Posession by AS Byatt. Margaret Forster has also written some books on this theme.
They don't necessarily need to be fiction either.
So, any suggestions for more books like this?