After a long and distinguished career defending the Imperium from its many enemies, Commissar Cain is enjoying a well-deserved retirement on Perlia, teaching in a schola progenium. But when a Black Crusade threatens the sector, all able-bodied citizens must rise to the defence, including Cain and his cadets. As the forces of Chaos overwhelm Perlia, can the wily commissar prove himself to be a real hero of the Imperium one last time?

Read it because
This entry from the Cain Archives takes the Hero of the Imperium into his greatest and possibly last battle. He's an old man in this one, pulled out of retirement for one last mission as the hordes of Chaos close in on the Imperium...