The Blood Angels Space Marines must defend their home world from the ravenous threat of the tyranid Hive Fleet Leviathan.

A tendril of Hive Fleet Leviathan has reached the Cryptus shieldworlds. The Imperium musters its strength, for the aliens must be stopped here, as next in the hive fleet’s path is the home world of the Blood Angels Space Marines, Baal itself. Many are the battlefields and the price of victory is steep… On Phodia, the sons of Sanguinius give battle to the dreaded Spawn of Cryptus. At Lysios, the Adepta Sororitas and Tempestus Scions hold the line against Leviathan. Far from the fighting, Blood Angels Sergeant Jatiel finds himself pitted against another threat, the necrons of Anrakyr the Traveller who may yet have a crucial impact on the greater war.