Magnus the Red considered himself among the most loyal of the Emperor's sons. It was he who first learned of Horus's corruption, but in trying to warn his father he earned the wrath of Leman Russ - primarch of the Space Wolves and self-styled Imperial executioner. Word of the subsequent attack on Prospero blurred the lines between ally and enemy, friend and foe.
This omnibus follows the tragedy of Magnus's fall, with the novels A Thousand Sons and Prospero Burns showing two very different sides of the same conflict.