Tiamat's Wrath is, ahem, Book 8 of The Expanse.
By the time you get to the 8th 500+ page installment of a Science Fiction epic, there isn't much more to say about the matter, I guess. You're not at that point unless you wanted to be at that point, after all; you don't accidentally get to Book 8.
And, since the author(s) have indicated that they will tie it all up in Book 9: Leviathan Falls, you might expect that Book 8 is mostly a book which makes that tieing-up possible.
Which is pretty accurate.
But still: it was surprisingly good! There were the regular action and thrills and chills that we have come to expect from The Expanse, but also much more to chew on, with deepening involvement of several of the newest characters, lots of time with our favorite existing characters, and strange new mysteries to ponder.
Put differently, it turned out to be the perfect book to keep me distracted from Nov 1 to Dec 14, a time when I was desirous of a fair amount of distraction.
But anyway: hurry up Leviathan Falls! This is the first time in 4 years that I've been fully caught up with The Expanse and it's left me with rather a gnawing, unsatisfied feeling.