Shadows of Treachery by Christian Dunn and Nick Kyme

Shadows of Treachery is a Horus Heresy anthology edited by Christian Dunn and Nick Kyme and published by Games Workshop's Black Library imprint in 2012. The collection gathers two brand-new novella-length stories alongside several reprints of audio dramas and a formerly exclusive short story, giving it a hybrid structure that serves both new readers catching up on hard-to-find material and series veterans looking for original fiction. The book spans major theatres of the galaxy-wide civil war — from the carnage of the Phall and Isstvan campaigns to the gathering darkness over Terra itself — as the traitor Legions press their campaign and the Imperium begins preparations for the defence of the Imperial Palace.

One of the anthology's key narrative threads follows Captain Alexis Polux and the Imperial Fists' fleet at Phall, a force seemingly forgotten by the wider Imperium as old rivalries are rekindled and the Iron Warriors position themselves to strike. This storyline draws directly on the bitter fraternal enmity between the primarchs Rogal Dorn and Perturabo — the feud between Dorn and his wayward brother given operational, violent form. The anthology's thematic focus on betrayal and compromised loyalty runs through multiple entries: as one contemporary notice observed, the stories collectively explore Dorn wrestling with treachery "where it concerns his traitor brothers," binding the collection's distinct pieces into a coherent whole.

As the twenty-second volume in the Horus Heresy sequence, Shadows of Treachery occupies a consolidating role. It draws together material that had previously circulated in limited formats — audio dramas and convention-exclusive fiction — and presents them in a single accessible paperback alongside new work, making it a valuable reference point for readers tracking the wider arc of the war. The contributor roster reads as a who's-who of Black Library's most prominent writers of the period: Dan Abnett, Graham McNeill, Aaron Dembski-Bowden, Gav Thorpe, John French, and Nick Kyme himself all appear, lending the anthology the collective weight of the series' core creative voices. Nick Kyme, one of the two editors, built his career at Games Workshop beginning as a staff writer and journalist on White Dwarf magazine before becoming a novelist and editor in his own right.

Goodreads data across more than 3,000 ratings places the anthology at 3.81 out of 5 stars, a solid mid-to-upper score for a shared-universe collection. The most detailed published assessment comes from The Founding Fields, where reviewer Shadowhawk described it as "one of the best anthologies that Black Library has put out, each story a perfect thematic…" piece — praise rooted in how tightly the collection's stories cohere around their shared subject of loyalty and betrayal. The Civilian Reader's coverage of the anthology also highlighted the way the Phall storyline and its companion pieces function as a thematically bound trilogy, a structural achievement that elevates the book beyond a simple grab-bag of reprints.

Readers already invested in the Horus Heresy sequence will get the most from Shadows of Treachery: the anthology assumes familiarity with the series' factions, primarchs, and ongoing conflicts, and the inclusion of previously released audio dramas means that dedicated followers may already own a portion of the content in another format. Those approaching the Horus Heresy for the first time would do better to begin with the earlier novels before arriving here. For committed series readers, however, the combination of original novellas and consolidated reprints in one volume makes this a practical and narratively rewarding addition to the shelf.