As the first assault on the Solar System begins, the strength of the Imperial Fists and the seemingly impregnable fastness they have built is tested at last…

Recalled from the Great Crusade after Ullanor, Rogal Dorn and the VIIth Legion were appointed as the Emperor’s praetorians – but only after the Warmaster’s treachery was revealed did the full extent of that sacred duty become apparent. Now, the Solar System comes under attack for the first time since the war began, and many of the seemingly impregnable defences wrought by the Imperial Fists prove inadequate. With all eyes fixed firmly upon this new threat beyond the gates of Terra, who in turn will protect Dorn from the enemy within?

At last, Rogal Dorn and the VII Legion take centre stage in a Horus Heresy novel! And it's a doozy, as the assault on the Solar System begins. Or does it?

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