From the back cover:
"The Empire has survived another Chaos Incursion but there will be no peace for Sigmar's Heirs. The northern provinces have been decimated, tens of thousands are dead, cities and towns have been sacked, and famine and disease follow in war's wake. Throughout the provinces prophets of doom predict the end of the world, flagellants and zealots preach blood and redemption, and Chaos cults undermine the foundations of order. This is the Empire in the year 2522, at once the greatest nation in the Old World and the most venerable. While the Emperor pursues the shattered remnants of Archaon's armies, who will struggle against the enemy within?"