As hive fleet leviathan swarms its way through the Imperium on course to the Blood Angels home world Ba'al, the Blood Angels have begun to set up walls and ambushes to slow down and cripple the Tyranid threat. But not all plans go the way they're meant too. Soon Cassidor a vanguard veteran sergeant finds himself and a diverse force of Blood Angels and Imperial guardsman stranded on a planet where Tyranids have broken through defenses and have begun to devour all things on the surface. Will they be able to survive long enough to escape this horrible outcome, or will this be their final stand as they fight in the name of the Emperor and the Great Angel