As the mysterious 13th Company of the Space Wolves Chapter emerge from the warp and a daemonic tide threatens to engulf their home world, the dark secrets of the sons of Fenris are laid bare.

The Space Wolves are a proud and fierce Chapter, who have a long and storied history. Not all of their sagas, however, are glorious. There are secrets buried deep in their past, and enemies eternal, earned by acts committed in a lost and half-forgotten age. When the worlds of Fenris come under attack from a malevolent daemon tide, all who serve the Fang answer. War engulfs the Space Wolves as never before, but amongst the carnage lurks a greater horror: the return of their lost brothers, the dark legacy of Russ. Can the Space Wolves survive the revelation of the Wulfen?