Magnus the Red: Master of Prospero

The third book in The Horus Heresy: Primarchs. Magnus the Red, psyker primarch of the Thousand Sons, hunts for lost sorcerous knowledge during the Great Crusade. Campaigning alongside his brother Perturabo of the Iron Warriors, he begins to sense a turning point in fate approaching, and must decide whether to stay his course or push further into mastery of the warp.