Following the events in Caliban’s War, the protomolecule shoots itself off into the far reaches of the Solar System, well beyond the orbit of Neptune. It forms a large ring. As it turns out, the ring is a gate to another place far away from the Sun. Mars, Earth and the Outer Planets organize expeditions to study the gate. Meanwhile, the sister of Julie Mao, the mysterious woman from Leviathan Wakes, has decided to disgrace James Holden, who along with the crew of the Rocinante, is also on his way to the gate. Needless to say, things rapidly go south, with the large multinational fleet of research and warships trapped beyond the gate in a mysterious “slow zone” which limits the speed of ships. And then things go south some more as internal fighting breaks out between various factions.
Just as in the previous books, the story is told via viewpoint characters, with excellent characterization. There is deep examination of motivation and personality without it getting in the way of the action. In some ways, the book, just like its prequels, reads like an action blockbuster, especially the last third of it. But it is deeper than that, showing the authors’ insight into human nature, society and politics. The world is granular and consistent, with little things like how Belters and Earthers think alike fully developed and really affecting the actions of the characters. The stakes are high and the situations often desperate. I couldn’t stop reading because the authors kept putting our heroes in situations that seemed impossible while the fate of humanity was on the line; a real skill.