Abaddon's Gate is a science fiction novel by James S. A. Corey (pen name of Daniel Abraham and Ty Franck).

It is about a conflict in the Solar System that involves the polities of Earth, Mars, the Asteroid Belt and the outer planets, and a mysterious self-replicating alien technology of immense power.

When a young belter attempts to "slingshot" his ship through The Ring on a dare and doesn't emerge out the other side, it is realized that the structure is a wormhole.

The OPA sends the generation ship Nauvoo, now repurposed as the military vessel Behemoth, under the command of Captain Klaes Ashford, with security officer Carlos "Bull" de Baca.

On Ceres, Holden, Alex, Amos and Naomi are taking a vacation, having made good money using the Rocinante as freelance courier and escort ship.

When the Cerisier gets close to the Rocinante, Clarissa sends a signal to the ship, which activates software secretly placed there by a member of the documentary crew whom she bribed.

Once inside the zone, the Rocinante crew repairs the communication system in order to contact the other ships and convince them of Holden's innocence.

He forces a confession out of the documentary crew member who planted it, who doesn't know Clarissa's name, but draws her face.

Both the Protomolecule and the Station were separate tools constructed by an alien race billions of years prior, and both maintain some degree of decision-making autonomy.

The Protomolecule, lacking control over the Station, needed Holden to be physically present to open the wormhole network and begin searching for its creators.

Trying to stop the spread of the attack, the Protomolecule's creators used the Station to destroy thousands of star systems, causing them to go supernova.

Because no ship can now move faster than a grenade, returning to The Ring would take years, leaving the survivors essentially trapped in the Slow Zone.

Ashford, imprisoned, conspires with Father Cortez to use the Behemoth's powerful communication laser to destroy The Ring, thinking they will save humanity from the "evils" brought by the alien technology.

When Holden hears of the plan, he realizes that if the Station considers humans a serious threat, it could cause the Sun to go supernova as it had done to the other stars he had seen in its vision.

Assuming that attempting to destroy the gate could risk the fate of the entire solar system, he gathers a crew of allies including Anna and Bull.

The OPA leaves the Behemoth (renamed Medina Station) in the Slow Zone as a waystation for ships traveling to the wormholes.