"The Private Patient" by P.D. James
What a treat to have another novel by P.D.! Sounds like this will be her last...inspired by being a patient herself recently with some heart trouble apparently. Vintage P.D. but then I am a great fan and not a great critic but I think most people would agree it's up to her usual standard and perhaps even better. I devoured it in our stormy Autumn weather...perfect weather for a mystery.