"Claus and Effect"
A store Santa vanishes after getting a death threat and the team suspects that the young man, a former child prodigy, may have been involved in criminal activity.
I saw the phrase "child prodigy" and immediately thought of Amy. Then I registered "Santa" and thought "I have to tell Amy." So I liked that they really did deal with the child prodigy dynamic -- the overbearing mother wasn't overplayed, and Glen's naive sweetness and earnestness didn't seem too over-the-top. And yes, I loved "don't be fooled by manufactured sentimentality designed to increase consumer spending" even as I sympathized with young Glen.
The reality of the implications of his math dawning on him felt believable to me, even though part of me is an evil capitalist and is like, "Well how much are they saving in this efficiency? Do we think it's sufficient to be worth the loss of these jobs?" That he managed to create a better system in only two hours is a bit hand-wavy. I did like his statement that downsizing is an "unoriginal," and whatever his other word was, solution. It felt in keeping with his love of mathematics and problem solving.
And as usual, I enjoyed Jack's dryness -- Viv's "It's a dark world you live in." and the bit with the Santa costume at the end.