Burden of duty : Grey angel

As the renegade forces of the Warmaster storm across the galaxy, a very different kind of war rages in the shadows of the Imperium - the Knights Errant, chosen of Malcador himself, move quietly in the dark places where others cannot.

Nathaniel Garro makes his way to the Imperial Fists' mighty starfort Phalanx, seeking out another kindred soul for his elite band of warriors.

Meanwhile, on a distant world, former Luna Wolves undertake a mission to ascertain the true loyalties of a Space Marine Legion.