The Buried Dagger

The final battle for the Throne is drawing close. Mortarion and his Death Guard are sent ahead of the Warmaster's forces, but in the warp their fleet goes astray and a terrible sickness spreads through the Legion that once thought itself unbreakable. To save his sons, Mortarion faces a choice with a terrible price.

On Holy Terra, meanwhile, a conspiracy aims to spread sedition and bloodshed ahead of Horus's armies. Malcador the Sigillite moves to stop it and finds a plot that tests all of his cunning. James Swallow's fifty-fourth Horus Heresy novel is the last before the Siege of Terra.