For thousands of years, Adeptus Coustodes remained true to his oath to protect Saint Terra and the Emperor God until his last breath. But when the Great Rift rips the Imperium apart, unleashing a host of demons on humanity, they face a dilemma. Should they continue to guard the Palace and the Golden Throne, or go back to the stars to uproot the very threat of the Absolute Enemy? When the shield-captain Kartovandis receives a mysterious distress signal from the planet Vorgantian, he gathers a team of bushes to investigate. Arriving on the planet, they discover that Vorgantian is in a state of self-destruction, flooded with Chaos cultists. In the race against time, the Custody must find out what happened and track down the guilty before the madness reaches its real goal something that is in the hearts of the Custody themselves.