When reports reach Terra of a Chaos incursion on Hyades, Ragnar Blackmane and his Wolfblade brothers are sent to investigate. But once there, they find that all is not what it seems. The Dark Angels, ancient rivals of the Space Wolves, are present and eager to allow old feuds to come to the fore. When both Chapters call in reinforcements, the situation quickly escalates out of control – and there is still the threat of renegades and traitors waiting for them...