Turn of Mind by Alice LaPlante

Jennifer White is a former hand surgeon who is slowly descending into demetia. She lives with a caretaker, Magdalena, but has trouble remembering who she is and what happens from day to day. Jennifer is also the police's prime suspect in the murder of her best friend, Amanda, who had several fingers removed from her hand. Of course, Jennifer can't help the authorities at all when they question her because of her condition. The book details Jennifer's day to day life though her unreliable eyes. The reader meets her overachieving daughter, Fiona, and son, Mark, who has a drug problem. As the novel progresses, one is immersed in Jennifer's murky world and wonders what is true and imagined. An absorbing read...