Shadow of Victory David Weber. This is part of the very long running space opera Honor Harrington series. And the series has really gone downhill. I don't know what happened to Weber, but he's phoning it in now. I've been following this series for I think most of 20 years now. And was really into it for a long time. But the recent books are less and less interesting. This latest one essentially did not move the main plotline of the core story forward at all. It was entirely filler. And I ended up skimming past near half the book. It took place coterminous with a couple of the other books, and was essentially all of a sideshow to the plots of the other books. With very little participation from any of the main characters of the series. It was essentially entirely unnecessary to the series. It just introduced, and then disposed of, a lot of unimportant side stories and characters. It's a lot like a Tom Clancy novel as a sideshow to space opera. Only not as well done.
The only reason I still read books from this series at all anymore (and only the ones I get from the library, haven't bought one of them in at least 10 years) is that after 20 years, I'd really like to see where it all ends up. But apparently Weber doesn't know either, and so we get stuff like this instead.