Actually, it (poison pen) seemed done and done again, if not by Morse. They were all of off their game, given that she should have been suspected because of the horse gun that she had ample unquestioned access to -- the car, the keys, the gun -- rather unbelievable she did something that dumb having transformed into a "remorseless killing machine" seemingly over such petty slights. For a single mother she had a cozy situation, home, job, well adjusted son.
I gagged a little bit as Morse heaped on the praise and she lapped it up ....and yet no suspicion of madness even as the body count rose. (Thats usually a Midsomer Murder complaint as some milquetoast goes on a rampage without a hair out of place. )
I noticed last week that Box and Co. had stopped with the gratuitous insults... silly me, I thought Box might realize that they didn't have the investigatory skill set to keep their positions for long, but I suspect Thursday noticed and wondered. Endeavor is in real danger if Box thinks he "owns" Thursday. No, I don't believe he's gone over to the dark side. ... but I've been wrong before.