Howl of the Hearthworld (The Horus Heresy Short Story)

In the wake of Prospero and Magnus' betrayal, Space Wolves watch packs were sent to keep an eye on each primarch, ready strike should treachery rear its head. One pack made their way to Terra itself, assigned to the Emperor's praetorian, Rogal Dorn... and they're not happy about it. After all, the only thing that awaits them on Terra is boredom. Isn't it? Read it because
The Wolves think themselves the guardians over the loyalty of the Legions even the castellans of Terra, the Imperial Fists. Find out how the wolf pack assigned to guard over the most redoubtable of all the Emperor's sons, Rogal Dorn, feel about their mission.