I blame the giant time gap between the first two and the last story of this season, but I failed to see the connection between the individual stories.
I was actually surprised to find out about the Polymath and the plan.
Now my initial choice was to pass on the letter to the Widow, because I felt terribly sorry for the Polymath and I didn’t want her to see me destroy her lifetime’s work right in front of her.
The text spoke of “lives she destroyed” and I couldn’t for the life of me remember what those were, but the sense of justice eventually prevailed in me and I decided to call the Constables. I think I am happy with my choice overall.