The Buried Dagger is the fifty-fourth and final volume in the The Horus Heresy series of novels. The Buried Dagger is the final novel in The Horus Heresy series. The story will continue in the The Siege of Terra, which will detail the Solar War and the Battle of Terra.
The skies darken over Terra as the final battle for the Throne looms ever closer... As the Traitor Primarchs muster to the Warmaster Horus' banner, it is Mortarion who is sent ahead as the vanguard of the Traitor forces.
But as he and his warriors make way, they become lost in the Warp and stricken by a terrible plague. Once thought of as the unbreakable, the legendary Death Guard are brought to their knees. To save his Legion, Mortarion must strike a most terrible bargain that will damn his sons for eternity.
Meanwhile, in the cloisters of Holy Terra, a plot is afoot to create sedition and carnage in advance of Horus' armies. Taking matters into his own hands, Malcador the Sigillite seeks to put a stop to any insurrection but discovers a plot that he will need all of his cunning and battle-craft to overcome.
- The Buried Dagger (Novel) by James Swallow