Having only just finished An Argumentation of Historians (the ninth book in the series), this short story was already published two weeks later. And it was completely not what I expected.
It is different from the rest in A) there is no 'investigating major/minor historical events in contemporary time' and B) the usual main characters almost play no role at all. Sure, Max is there drinking wine but not doing much more.
It was nice to have a background story for the supporting cast of the series, but it was a weird kind of story. As you might recall, Max travelled to a parallel dimension somewhere around book three/four (I honestly don't recall) and has been living since in a world with the Time Police. Some other things are also different, but just how different it was always difficult to tell because Max, and the reader by extension, is very ignorant of her surroundings and little important things like who is king/prime minister or what year it is. Tea, I can tell, is still plentiful, which is the only thing that counts.
So we are thrown into a civil war (simply called THE civil war for confusion) in this timeline, and while I would love to know more about this alternative reality, I would have liked to see some more introduction because sure, they were rebels of some kind. But that was about it. Now I left wondering about the details, and also if we will get more like this in the future.