Below is the complete list of James S.A. Corey’s Expanse books in order. For this series, the chronological reading order is the same as the order of publication.
Publication Order of The Expanse Books
- Babylon’s Ashes (2016)
Babylon’s Ashes was published in 2016 and is listed as book #6 in the Expanse series. 
Publication Order of The Expanse Limited Books
Publication Order of The Expanse Origins Books
Publication Order of The Expanse Short Stories/Novellas Books
About The Expanse
James S.A. Corey’s Expanse series is a large-scale science fiction saga about humanity’s expansion through the solar system, the political fractures that follow, and the terrifying consequences of encountering a technology far older and more powerful than human civilization. Written by Daniel Abraham and Ty Franck under their shared pen name, the series begins with Leviathan Wakes and runs through nine main novels, supported by shorter fiction collected in Memory’s Legion. It is one of the most important modern space operas because it combines the scope of interplanetary conflict with the intimacy of shipboard loyalty, personal guilt, and fragile trust.
The early books establish a divided solar system. Earth is old, powerful, crowded, and politically dominant. Mars is militarized, ambitious, and shaped by a dream of terraforming. The Belt is exploited, under-resourced, and culturally distinct, its people living in stations and ships where air, water, gravity, and labor are matters of survival. This three-way tension gives the series its first political engine. The conflicts are not abstract arguments about government; they are built into bodies, accents, jobs, food, illness, and the daily reality of people living far from planetary comfort.
Leviathan Wakes introduces the two strands that define the opening movement: Detective Miller’s investigation into Julie Mao and the survival of the crew that will become associated with the Rocinante. Jim Holden, Naomi Nagata, Amos Burton, and Alex Kamal form the series’ central found family, though the books are never limited to their perspective. As the sequence develops through titles such as Caliban’s War, Abaddon’s Gate, Nemesis Games, and Babylon’s Ashes, the story widens from noir mystery and outbreak horror into war, revolution, political collapse, and the reshaping of human possibility.
The protomolecule is the series’ great destabilizing force. It begins as a mysterious alien technology that human factions try to control, weaponize, hide, or understand, but it repeatedly exposes the limits of human ambition. The opening of the ring gates changes the scale of the books dramatically, turning a solar-system conflict into a story about colonization, empire, and humanity’s entry into a network it did not build and cannot fully comprehend. Corey’s strength is that the grand science fictional premise never erases practical consequences. Every breakthrough creates refugees, markets, military panic, political opportunity, and new forms of violence.
Publication order is the best way to experience The Expanse because the series is deliberately cumulative. The main novels move through distinct phases: the protomolecule crisis, system-wide war, the opening of the gates, the rise of Laconia, and the final confrontation with forces beyond human politics. The novellas and short stories add important texture, including background on major characters and events, but the nine novels carry the core architecture.
The series also stands out for its ensemble cast. Chrisjen Avasarala brings political ferocity and moral pragmatism; Bobbie Draper brings martial discipline and personal honor; Drummer, Fred Johnson, Clarissa Mao, Elvi Okoye, and others widen the moral and political field. Few characters remain simple representatives of a faction. The best of them change because history forces them to see beyond the story they were born into.
The Expanse novels endure because they understand scale. Space is vast, but people remain local: loyal to a ship, a family, a cause, a city, a planet, or a memory. The series turns interplanetary war and alien mystery into a long argument about responsibility. Humanity keeps reaching outward, but Corey’s central question is whether it can grow wise enough to survive what it finds.