After thousands of years of expansion and conquest, the human Imperium is at its height. His dream for humanity accomplished, the Emperor hands over the reins of power to his Warmaster, Horus, and heads back to Terra. But is Horus strong enough to control his fellow commanders and continue the Emperor’s grand design, or will such incredible power corrupt him?

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It all begins here. Witness Horus the hero, humanity's greatest champion and the Emperor's favoured son, before it all goes horribly, tragically wrong...

The eBook edition includes integrated illustrations of characters and events from the story, and an afterword that places the story in context within the series.