The Warhammer 40,000 Codex books contain the complete rules for playing various armies in Warhammer 40,000. They also contain in-depth painting guides, army lists, and much more.
From the back cover:
The Dark Angles and the Blood Angels Space Marine Chapters are both dedicated guardians of the Imperium and loyal servants of the Emperor. To mankind, they are awe-inspiring figures that bring hope and salvation. To the enemies of mankind they are creatures of terri and dread. Yet each harbours a sinister millennia-old secret that sets them apart from their brother Space Marines and may yet bring them both eternal damnation.
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