Europa, by Aurora Springer
Styx
The author seems to feel that bowdlerising is a good thing, and has therefore replaced standard expletives in speech or thought throughout the book with the word "styx".
This is almost as irritating as the frequent occurrences of "dove", not as a bird, but as the American past tense of "dive" (and, given that the story takes place almost exclusively under water, diving is a common activity).
I haven't yet come across an example of "you're styxed, pal" or similar, but I hope there is one.
A slow start
Styxes aside, the book gets off to a slow start, with only one major and one other significant event occurring in the first 7 (of 31) chapters, and other than that, a lot of (literal) waiting around on the part of the main character we seem to be following.
A story develops
About half-way through, we get into a decent story, and it's pretty well written. Whether the actions of some of the characters involved are entirely plausible is a matter of personal choice.
Then, once we get two-thirds of the way through the book, everything changes and we get a new focus for everyone involved. The closer we get to the end, the more obvious it becomes that there isn't time for many things to come to a conclusion, and sure enough by the time we get to the end, it turns out to be the first part in a series.
That said, the story comes to its own adequately satisfying conclusion (unlike The Three Body Problem, by Cixin Liu) and aside from styx and dove, as mentioned above, is a good read.