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techno-thriller
Series · science fiction
Belisarius Cawl
The Belisarius Cawl series by Guy Haley has 3 known books (3 published) and is best read in publication order, starting with Belisarius Cawl: The Great Work (2019). The latest book with a fully recorded publication date is Archmagos.
- Books
- 3 known books (3 novels)
- Published
- 3
- First published
- 2019
- Status
- completed
- Shelved under
- Science Fiction
- Last checked
Start here: Belisarius Cawl: The Great Work (2019) — then read straight through in publication order.
Reading order
The date order of published books and any announced future entries — the default way to read the series.
- Book 1:
Belisarius Cawl: The Great Work
The Great Work opened Guy Haley's Belisarius Cawl trilogy in 2019 at 416 pages -- the longest of the three novels -- sending the Archmagos to the dead world of Sotha in search of a lynchpin technology for his self-appointed Great Work.
Alternative text for cover: Cover of Belisarius Cawl: The Great Work - Book 2:
Genefather
Genefather followed in October 2023 at 352 pages, pitting Archmagos Belisarius Cawl against his dark mirror, the renegade Chaos scientist Fabius Bile, at the gathering on Pontus Avernes -- the middle chapter of Guy Haley's trilogy about Cawl's self-appointed Great Work.
Alternative text for cover: Cover of Genefather - Book 3:
Archmagos
Archmagos closed the trilogy on 21 November 2025 at 384 pages, with Cawl racing to secure ancient necron control codes as Roboute Guilliman's window to act narrows.
Alternative text for cover: Cover of Archmagos
About the Belisarius Cawl series
The Belisarius Cawl trilogy follows the Adeptus Mechanicus' most brilliant and heretical Archmagos -- creator of the Primaris Space Marines and secret architect of much of the Imperium's modern military resurgence -- as he pursues his self-appointed "Great Work": a millennia-spanning plan to save humanity that answers to no one, not even the Emperor. Belisarius Cawl: The Great Work (2019) sends Cawl to the dead world of Sotha in search of a lynchpin technology for his plan; Genefather (2023) pits him against his own dark mirror, the renegade Chaos scientist Fabius Bile, at the gathering on Pontus Avernes; Archmagos (2025) has Cawl racing to secure ancient necron control codes needed to stabilize a passage into the Imperium's isolated far side, as Roboute Guilliman's window to act narrows.
Guy Haley has written Cawl as one of Warhammer 40,000's most quietly unsettling figures -- a being who long ago stopped answering to any human chain of command and now manipulates the Imperium's highest authorities toward ends only he fully understands, giving the trilogy a distinct flavour of scientific-conspiracy thriller inside the wider setting's war fiction.
Frequently asked questions
How many books are in the Belisarius Cawl trilogy?
Three: The Great Work (2019), Genefather (2023), and Archmagos (2025).
What order should I read the Belisarius Cawl books in?
Publication order: The Great Work, Genefather, Archmagos.
Who is Belisarius Cawl?
The Adeptus Mechanicus Archmagos who secretly created the Primaris Space Marines and pursues his own millennia-long plan to save humanity, answering to no one -- not even the Emperor or Roboute Guilliman.
Is the Belisarius Cawl trilogy finished?
Yes, as of Archmagos (2025) the trilogy is complete; no further volumes have been announced under this title as of this writing.
If you like the Belisarius Cawl series
Reading order last verified .