Book one of a new 12 part curated series, featuring 12 classic Horus Heresy novels that follow the main line of narrative from the beginning of the Heresy to the beginning of the Siege of Terra. The seeds of heresy are sown At the dawn of the 31st millennium, the Imperium of Man has reasserted its dominance over the galaxy. It is a golden age of rediscovery and conquest, and the Emperor's Great Crusade has placed his superhuman primarch sons at the head of the mighty Space Marine Legions - the most powerful military force ever assembled. Newly promoted to serve as the Emperor's Warmaster, the idealistic Horus now stands above his brothers, even as the crusade enters what must surely be its final stages and dark, cosmic truths begin to reveal themselves. Far beyond the alien threat of malignant xenos breeds or rogue human civilisations, a war now looms that could threaten the very existence of mankind.