In the dying days of the Second War, Major Ambrosius Roth faces a task that seems destined to fail – to hold the walls of the doomed hive against a massive xenos assault. Lacking resources and reinforcements, Roth finds himself outnumbered, outgunned, and rapidly running out of time.

As Armageddon burns and Tartarus begins to break, Sister Superior Sabreen of the Order of Our Martyred Lady is the last protector of a saint’s precious relics. But an evil has seeped into the foundations of Tartarus, one that will force her to make an impossible choice.

Brother Gavriel, a headstrong young Blood Angel, finds death and glory in equal measure amidst the ruins of the broken hive. With Imperial forces crumbling around them, the Angels of Death must fight their way to the dark heart of Armageddon on a merciless quest for revenge.

Facing annihilation, each of them must decide what their sacrifice will be worth.