For ten thousand years Cadia has stood firm against the horrors spewed forth by the Eye of Terror. There are no records of how many valiant souls have fallen defending the fortress worlds of the Cadian Gate – but by their sacrifice, the tide of horror stemmed. But there is no sacrifice big enough to stop what is coming. Abaddon has unleashed the full might of his thirteenth Black Crusade and little hope remains. On Cadia itself, Ursarkar Creed and manifold Imperial forces mount a desperate defence, and they are soon to be joined by the strangest and most powerful of allies. Their arrival spurs a chain of events that will change things forever – the pylons will fall, the Eye will open, and a storm will come.