Speedy Death (Black Dagger Crime Series)

Dr Beatrice Bradley is elderly, ugly, has darkly sharp insights and an extremely wicked tongue. 1929 genteel country house guests are shocked by the death of their famous guest, world traveler Mountjoy, in a bathtub. Suspects include his quiet (but extremely competent) fiancee Eleanor, pompous Alastair and forceful son Garde, engaged to lovely Dorothy, plus curious naturalist Carstairs.