Watson's choice

Mitchell's series detective, Dame Beatrice Adela Lestrange Bradley, "psychiatrist and consulting psychologist to the Home Office with degrees from every university except Tokyo," and her assistant Laura Menzies have been invited to a house party organized around an elaborate Sherlock Holmes costume theme. The host is obnoxious and wealthy Sir Bohun Chantry, and the guest list is small but varied; a few friends, several family members, and Miss Menzies' fiancee, CID inspector Robert Gavin. With the possible exception of Bradley, Menzies and Gavin, everyone present has a reason to dislike…