From the Back Cover:
Roleplaying in the Grim Darkness of the 41st Millennium
You are a Heretic; a renegade turned against the oppressive government of Humanity, the Imperium of Man. The crumbling monolith mobilizes the might of its numberless armies and deadly agents, and you must stand against it.
However, you do not stand alone. At your fingertips you have the might of ancient powers, the Gods of Chaos. With their gifts, you have the potential to lead a Black Crusade and destroy the Imperium of Man. But can you realise your destiny before that power consumes you?
Play as either a powerful Chaos Space Marine or a skilled and cunning Disciple of Chaos in your fight against the Imperium. Then use the freedom of the Archetype character creation and advancement system to build the character you want to play.
Dynamic rules for all eventualities let you handle everything from social interactions to combating hordes of foes.
Embrace the Dark Gods and earn their blessings through mutations and powerful Marks of Chaos.
Comprehensive background on the Ruinous Powers, the Imperium, and the Long War against Chaos, written by Andy Chambers and Warhammer 40,000 Novelist Andy Hoare.
A full preliminary adventure thrusts your players onto the path to glory and action!
The Black Crusade core rulebook contains everything you need to start your adventure in the Warhammer 40,000 universe.