This book was just fun. A classic mystery (as in the genre sense) with some good twists. Achieved the key function of a mystery: present the readers with all the clues but still make the final reveal exciting (if not necessarily surprising). There are definitely Sherlock Holmes vibes, but not in a bad or distracting way. If you ever were like, "wow I wish there was a gender-bent, even gayer, version of Sherlock Holmes mysteries set on another planet" then... ta-da. 

I don't want to get much into the main themes of the book because that would give away some of the clues, so I'll just focus on the setting. The book is set on Jupiter, and seeing how humans have developed ways to live on a gas giant is really interesting. Trains are a big part of the plot. Some people might be bothered by the lack of detailed world-building, but because this is a novella, there isn't much space to go into the science of how this all works. The reader is just supposed to accept things the way they are. Making the book longer would've made the mystery drag; adding more world-building would've broken up the tension too much. A novella is really the perfect format for this story. Also, some of the tech they describe sounds really cool. Especially the heated chairs? How cozy.

Mossa and Pleiti are really likable characters. Mossa is the detective, and the way she is described makes me think she is on the spectrum. I'm not an expert, but from what I understand about ASD, she seems to fit some of the symptoms, although a diagnosis is never mentioned on the page. Pleiti is a scholar and adorable. The way she writes (as she is the first-person narrator, remember the Sherlock Holmes vibes I mentioned) could be a little off-putting to some people as it is kind of strange, but I think it fits the style of the book very well. The reader gets a sense that this is set Elsewhere and Elsewhen—and also Pleiti's over-educated self (which she makes fun of). 

Overall, this is a cozy little mystery that features compelling characters, a fun mystery to solve that isn't very dark or gruesome (there are no dead bodies or otherwise gruesome events depicted on the page), and can easily be read in one sitting.