After ruthless Chaos Space Marines of the Black Legion launch a surprise attack on the crucial industrial world of Garatus, the Second Company of the loyalist Ultramarines Chapter mount a swift counter-attack. Now, they face a sudden uprising of worshippers of the Dark Gods in the bowels of Vanatine Hive, a towering city home to billions. The Cultists' nefarious plan is quickly revealed – they plan to destroy the hive city with an ancient doomsday device. Squad Artellus have been dispatched into the depths of the hive to put a stop to the plan and prevent the city's doom against a never-ending horde of crazed enemies. —description from the publisher