The final part of book 8 of the global bestselling series, "The Horus Heresy: Siege of Terra". The Great Angel, Sanguinius, lies slain at his brother's hand. Terra burns as reality itself unravels and the greatest bastion of civilisation teeters on the brink of annihilation. Desperate defenders gather, banding against the rabid traitor hordes. The Hollow Mountain, host to the pilgrims of Euphrati Keeler, is one of the last redoubts,...