This is the third installment of The Expanse series. The protomolecule has left Venus and created a mysterious ring near Uranus. All powers want to be represented should something come of it, and have no idea what is there.
At the start of the book, a young belter is flying a ship at high-speed to the ring intending to travel through it. Mars tries unsuccessfully to stop him, but he enters the ring but doesn’t come out. Later, we learn that inside the ring the maximum speed is reduced because the protomolecule viewed this as a threat.
Mars is filing a claim against the Roci and he is blocked from leaving Ceres. When a news team comes with intent of interviewing the team and heading out to the ring. A journalist has gotten the hold lifted so the Roci can fly to the ring on the pretense of doing an interview. It is later revealed that Clarissa Mao, sister of Julie Mao and daughter of the president of the business Holden destroyed is out for revenge.
Being guided by Miller, Holden ventures into the heart of the ring. Here, stars are not visible, and anything exceeding a protomolecule-imposed spead limit is herded into a central orbit with no escapte. Holden does an EVA and flies to the central core of the ring, there he learns that the protomolecule has the potential to cause the sun to go nova and destroy all of humanity – if it views humans as a threat.
Meanwhile some of the people have decided that the best course of action is to attack the ring, a course of action that could destroy all of humanity. From here it becomes an action story where Holden has to avert the threat and convince all ships to power down in order to convince the protomolecule that they aren’t a threat.
The book is exciting. I read it after having seen the third year of The Expanse series on tv and found the book much more interesting. The story is told as a kind of third person somewhat-omniscient narration. The narrator provides insights on on character at a time, changing with each chapter; this provides great insight into each character. These perspectives make the story more engaging than the tv series.