The Great Crusade that has taken humanity into the stars continues. The Emperor of mankind has handed the reins of command to his favored son, the Warmaster Horus. Yet all is not well in the armies of the Imperium. Horus is still battling against the jealousy and resentment of his brother primarchs and, when he is injured in combat on the planet Davin, he must also battle his inner daemon. With all the temptations that Chaos has to offer, can the weakened Horus resist?

The epic tale of The Horus Heresy continues in the sequel to Horus Rising. The fate of the galaxy now rests in the simple choice of one man; loyalty or heresy?