'In the war-torn 41st millennium humanity stands on the shores of damnation. Its only saviour is the immortal God Emperor and the massed armies of the Imperium'.
Source: Back cover
Chaplain De Haan of the Word Bearers (Chaos Space Marines and fanatical cultists of the Chaos gods) builds a monstrous chapel, hoping to finally gain revenge against the Eldar (elf-like humanoids) who have thwarted his ambitions in the past. But the Eldar are using his madness and his thirst for revenge against him.