NO, NO, NO!
I have so enjoyed this series, including this book, until the end, and what I believe is a mistake, Mr Cartright.
"The bet" is something hinted at all through the investigation but finally extended and exploited by the supposed woman in charge at the expense of her second-in-command. No way would she allow it to take place. No way, if hints at her affection for him are to be believed, would she ever have caused him to denigrate and embarrass himself in front of subordinates when a layer of privacy and respect in their working relationship should be preserved as sacrosanct. I'm unsure at this moment whether I want to move on to the next book.