Book 3 in the Mephiston series Deep in Imperium Nihilus, Blood Angels Chief Librarian Mephiston and his comrades are drawn into battle with a cabal of Thousand Sons sorcerers – with worlds at stake and hidden truths threatening to overwhelm him, this is Mephiston's darkest hour… READ IT BECAUSE Experience a battle of psychic might in the Dark Imperium, and witness Mephiston taking on his greatest challenges ever, physically, mentally and emotionally. THE STORY Having fought during the devastation of Baal, Mephiston and a cohort of Blood Angels are drawn by cryptic visions to a war-torn world on the cusp of the Great Rift. Here, the sorcerers of the Thousand Sons seek to unite nine Silver Towers and bring about a ritual that will empower their master, the daemon-primarch Magnus. The ritual must be prevented, lest the entire sub-sector be cast into Chaos. Mephiston faces a challenge like no other, of his strength and his will, confronting a hidden truth that threatens to expose him to his darkest fears.