The Laconian Empire is in disarray as its leader, Winston Duarte, has disappeared. Colonel Aliana Tanaka, a particularly cold, and coldly effective, servant of the Empire, is tasked to find him. Meanwhile, the crew of the Rocinante races to stay ahead of Laconian forces. The fabric of reality is tearing as intruders from outside the Universe try to reassert control.
The final instalment of The Expanse is in many ways a fond farewell to the crew of the Rocinante and their associates. Even those no longer alive, like Avasarala and Bobbie Draper, are mentioned and celebrated. While Leviathan Wakes was about a family, a crew, coming together, this book is about how all good things must end, and the family, the crew, eventually sees its members going their separate ways. A solid ending to the series.