Rafen, a Space Marine of the Blood Angels, is torn between his loyalty to his chapter and that of his blood-brother Arkio.
As his brother Arkio is proclaimed the reincarnation of the Lord Primogenitor Sanguinius all give fealty to the Reborn Angel.
All except Rafen that is. Inquisitor Remius Stele, a servant of Chaos manipulates the situation to cause a schism in the Chapter. From the Blood Angels home world of Baal comes the ruthless Lord of Death, Mephiston, sent forth by Chapter Master Dante to investigate and to judge, and he isn't known for his sense of mercy.