When Ragnar Blackmane and his Wolfblade brothers are sent to Hyades to investigate reports of a Chaos incursion, they find that all is not what it seems. The Dark Angels are present, the Space Wolves' most bitter rivals. As old feuds come to the fore, both sides call in reinforcements and the situation quickly escalates out of control.
Read it because
The rivalry between the Space Wolves and Dark Angels is a cornerstone of both Chapters, and it's always fun seeing them work out their differences and unite to face a common foe.