Necropolis (Gaunt's Ghosts #3)

On the shattered world of Verghast,Gaunt and his Ghosts find themselvesembroiled within an ancient and deadly civilwar as a mighty hive-city is besieged by anunrelenting foe.
On the world of Verghast, a grinding war between two hive cities - one loyal to the Imperium, the other fallen to the worship of the Dark Gods - is bolstered by the forces of the Astra Militarum, spearheaded by the Colonel-Commissar Gaunt and the Tanith First and Only. But bitter rivalries and treachery threaten to derail the defence of Vervunhive, and it falls to Gaunt to take command of the Imperial forces and forge victory from an almost certain defeat.

Read by Toby Longworth.