Might I suggest my two favourite genres: sci-fi and fantasy.
Last Friday would have been the 95th anniversary of my favourite author, who successfully merged the two genres with her Saga of Pliocene Exile books: Julian May. She also found success with the linked Galactic Milieu books which, with the SPE series, totalled eight (nine in the US) of the best novels I have ever read; it also incorporated an incredible whodunit within the GM books.