A Horus Heresy novel

Having weathered the Word Bearers’ attack on Calth and the subsequent Shadow Crusade against the Five Hundred Worlds, the Ultramarines primarch Roboute Guilliman now draws all loyalist forces to Macragge as he contemplates a new future for mankind.

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Perhaps the greatest secret of the Horus Heresy is revealed, as Roboute Guilliman commits an act that could be considered treachery. At the same time, primarchs converge on Macragge. Guilliman, the Lion, Vulkan and the insane Konrad Curze all in the same place... there are going to be fireworks.