Just as the Space Wolves’ battle against Chaos seems to be taking a turn in their favour, discord strikes the heart of the Imperial forces. In the crusade fleet, accusations of treachery fly – just how far has the dark touch of Chaos reached, and can anyone be trusted? The Space Marines are forced to put their differences aside and confront the true villain – whatever the cost, this is the only way to achieve victory over the forces of darkness.
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After seven previous instalments of Fenrisian action and Chaotic intrigue, it all comes down to this: someone in the Imperial battleforce is a traitor. But who? And who's really behind the cataclysm that has beset the Space Wolves? Only one way to find out...