If you like between-war (20s and 30s)
novels with a British wit, the prototype for these is Nancy Mitford, especially The Pursuit of Love, Love in a Cold Climate, and The Blessing. Also The Water-Beetle, Highland Fling, and Don't Tell Alfred. She also wrote two regular history books, The Sun King and Frederick The Great. This author's sister is Jessica Mitford who wrote The American Way of Death, among other things. Don't miss any of them!