Bruce Gray. Clever, exciting self-contained story, with a terrific and powerful villain. Also: a rushed but incredibly satisfying resolution to the story arc questions from season one, dealing with Toby’s mother.
Die-hard fans (such as myself) will be overjoyed to see this brought to conclusion in the last episode, and by an important conversation between Toby and Becker about Charlie Marks.
A worthy ending to a great TV show. I will miss it very much indeed. 10/10