This Is How You Lose the Time War
by Amal El-Mohtar and Max Gladstone
This is a fascinating book that has both time travel and a branching universe physics as the background to a war between monolith entities, and all of that as a background to the relationship that builds/grows between Red and Blue, the respective top agents of each side. They are each other’s main foe and foil and the book starts when they begin an unsanctioned correspondence.
The authors make the extremely good decision to not explain how the technology works, or the physics of the universe, since that would simply bog down and distract from the relationship that is the focus. And so the hints and peaks of that background are little teasers that define a rich background and could act as prompts for a hundred other stories. But this story is about two agents who are closer to each other as enemies than they are to their allies, comrades, or commanders.
How, and why, (and when!) that relationship develops has it’s own twists and turns. While this is not a long book (less than 200 pages), there were several points where I thought I knew how it was going to go and then it twisted away in such a manner that was both completely unexpected and yet entirely perfect and how had I not seen that coming?
A good portion of the book consists of the letters that Red and Blue send to each other, so there are also three distinct voices in the text: Red, Blue, and the third-person omniscient narration that alternates which character it’s following. While the letters sometimes get a bit florid for my taste, it’s also interestingly true to the characters who write them.
This is a beautiful and fascinating story and I definitely recommend it.