Clara’s Verdict
Dan Abnett is the best writer working in the Warhammer 40,000 universe, and Hereticus — Book 3 in the Eisenhorn series — is the proof. This is a novel about what happens when a good man bends his principles so many times that he can no longer determine, with any confidence, whether he has broken them. Inquisitor Eisenhorn has done terrible things in service of the Imperium; by the time Hereticus concludes, the question of whether he remains a hero or has become something rather more unsettling is genuinely open. Toby Longworth’s narration is superb — consistent, characterful, entirely committed. With a 4.7-star rating from 845 reviews, this is about as validated a listening choice as the genre offers.
About the Audiobook
Eisenhorn is hunted. Formerly one of the Inquisition’s most celebrated agents, he is now regarded by his former allies as a radical — a man who has used the tools of the enemy (including daemon summoning, which is exactly as alarming as it sounds) in the service of supposedly righteous ends. Fleeing this judgement, he sets himself to track down the dread former Inquisitor Quixos, whom the Inquisition believes dead but who Eisenhorn knows is very much alive and enormously dangerous.
What follows is a novel of escalating moral compromise. Abnett is precise about the logic of Eisenhorn’s decisions — each step towards darkness is comprehensible, justified in the moment, and cumulatively devastating. The travelling carnival that provides one early setting is a piece of classic SF/horror atmosphere; the pictographer subplot adds genuine mystery. But it’s the central question — how far can you go using the enemy’s weapons before you become the enemy? — that elevates this beyond genre entertainment into something genuinely thought-provoking. Running to 9 hours and 48 minutes, published by Black Library in 2017, it wraps the trilogy with the satisfaction it earns.
The Narration
Toby Longworth has been Eisenhorn’s voice across the trilogy, and his performance here is the strongest of the three. He has lived with this character long enough to find new textures in the later, more compromised version — the slight hesitations, the defensive justifications, the moments where Eisenhorn’s confidence in his own righteousness flickers. Longworth handles the action sequences with kinetic energy and the quieter moments of moral reckoning with weight. For listeners new to the Eisenhorn trilogy in audio, his work is reason enough to choose this format over print.
What Readers Say
The audiobook carries a 4.7-star rating from 845 reviews — an exceptionally strong signal across a large sample. C. Larsen called it « pure action and badassery wrapped up in a great story, » noting in particular the conspiracy at its heart. Juice Free, a long-term Abnett reader, described it as « possibly the final Eisenhorn novel, and if so, a fitting finale » — though the series has since continued. Robert MacDonald praised both the writing and the voice work without reservation. Lydia noted it was « highly recommended for sci-fi and Warhammer fans » — and, I’d argue, for anyone who enjoys morally complex protagonists navigating impossible choices.
Who Should Listen?
Essential for Warhammer 40,000 fans who haven’t yet encountered Abnett’s work, and highly recommended to any SF/dark fantasy listener who enjoys grimdark settings with real philosophical substance. You should begin with Book 1 (Xenos) and work through in sequence — the Eisenhorn trilogy rewards cumulative investment. Those who’ve already devoured the earlier volumes will need no prompting to complete the set. Available on Audible UK.
