“Flesh and Blood: A Scarpetta Novel” (William Morrow, $28.99) is Patricia Cornwell’s 22nd novel featuring forensic medical examiner Kay Scarpetta, so there are some assumptions that can be made at the start. She is married to FBI profiler Benton Wesley, living in Cambridge, Mass., in a beautiful and expensive 19th century house on the northern border of the Harvard University campus, working freelance for the Cambridge Forensic Center (CFC) and various other government organizations.