After a long and distinguished career, Commissar Ciaphas Cain, famed defender of the Imperium against its many enemies, enjoys a well-earned retirement on Perlia, training the underlings of the Schola Progenium in the commissar's trade. After clearing Perlia of the remnants of the Ork invasion, the planet became quiet and calm; if any tyranids arise, then this is even good for maintaining good shape. However, the next Black Crusade is a more serious thing. And when the forces of Chaos fall on Perlia, the cunning commissar will have to prove himself again in order to save the title of Hero of the Imperium, his own skin and at the same time the entire planet. The Imperium's most heroic coward reluctantly returns to the front lines!