In the grim darkness of the far future, there is only War. Forces of Chaos blight planet Unvos' landscape. The Planetary Defense Force has fallen. The Imperial Guardsmen are under siege. A distress call has been sent. And the Sons of Fenris will answer the call.

The Blood Angels' Assault Marines are among the best shock troops the Imperium has to offer. They are unmatched in melee, and fiercely loyal to the Codex and the God-Emperor. Since before the Horus Heresy, however, the Chapter has held a dark, dangerous secret...