The Eisenhorn Trilogy is Dan Abnett’s three-book saga about Gregor Eisenhorn, an Imperial Inquisitor hunting heretics and daemons while trying not to fall to Chaos himself. It’s one of the most popular pieces of Warhammer 40,000 fiction ever written, and for a lot of fans it’s the gateway into the whole setting.
What the trilogy actually is
Three novels published in quick succession: Xenos (2001), Malleus (2001) and Hereticus (2002). They follow Eisenhorn across decades of his career, from a relatively orthodox Inquisitor to a man who’s bent more and more rules to get the job done.
Abnett writes it as a crime-flavoured science fantasy. Investigations, interrogations, conspiracies and betrayals, all wrapped in the grimdark 40k setting. That tone is a big reason it reads so easily even if you’ve never touched a rulebook.
Why it matters
Before Eisenhorn, most 40k fiction was bolter-porn or tie-in filler. This series showed the setting could carry real character work, moral ambiguity and a long-form arc, and it helped push Black Library into the mainstream.
It’s also the anchor of Abnett’s wider Inquisitor cycle, which continues with the Ravenor and Bequin trilogies. If you want to understand how the Inquisition operates in 40k, this is where most readers start.
Books, stories and collections
The core three novels are the main event. Everything else is either a companion piece or a later addition, and you don’t need them to follow the story.
- The 2004 omnibus collects all three novels plus the short stories Missing in Action and Backcloth for a Crown Additional.
- Thorn and Talon (2011/2012) is a set of audio shorts, and The Keeler Image (2014) is a later audio drama.
- The Magos (2018) is a novel-length follow-up that also includes The Definitive Casebook of Gregor Eisenhorn, a prequel short story compilation.
- Born Unto Us is a short story published online in 2012.
| Title | Type | Year |
|---|---|---|
| Xenos | Novel | 2001 |
| Malleus | Novel | 2001 |
| Hereticus | Novel | 2002 |
| Eisenhorn (Omnibus) | Collection | 2004 |
| The Magos | Novel / collection | 2018 |
Adaptations and spin-offs
Eisenhorn: Xenos, a third-person action-adventure game by Pixel Hero Games, adapted the first book and came out on Steam in August 2016. Reviews were mixed.
In July 2019, Frank Spotnitz (The Man in the High Castle) announced he was developing a live-action TV adaptation as showrunner, with Emily Feller as executive producer. Nothing came of it, and the option had likely lapsed by 2022 when Amazon started negotiating for 40k TV rights. So no, there’s no Eisenhorn show to watch yet.
Key facts
- The Eisenhorn Trilogy is three novels by Dan Abnett: Xenos (2001), Malleus (2001) and Hereticus (2002).
- It follows Inquisitor Gregor Eisenhorn as he hunts heretics and daemons while trying not to fall to Chaos himself.
- A 2004 omnibus collects all three novels plus the short stories Missing in Action and Backcloth for a Crown Additional.
- The Magos (2018) is a later follow-up novel that also includes The Definitive Casebook of Gregor Eisenhorn.
- A video game adaptation, Eisenhorn: Xenos, released on Steam in 2016 and got mixed reviews.
- A live-action TV adaptation was announced in 2019 but never happened.
FAQ
Do I need to read the Eisenhorn Trilogy before Ravenor or Bequin?
It helps a lot. Ravenor follows characters and events set up in Eisenhorn, and the Bequin books tie both series together. Reading Eisenhorn first gives you the context those later stories assume.
What order should I read them in?
Publication order works best: Xenos, then Malleus, then Hereticus. After that, Ravenor, then Bequin. The omnibus collects the first three plus two short stories if you want them in one volume.
Is the Eisenhorn Trilogy a good starting point for Warhammer 40k fiction?
Yes, it’s one of the most recommended entry points. It doesn’t assume you know the setting, and it’s more character-driven than a lot of 40k tie-in fiction.