"Betrayal at Calth"
- —Book's tag-line
The Unburdened is a novella in the Horus Heresy Series, released as a Black Library hardback. The Unburdened is part of a duology, the other being The Honoured, and both were released together in a limited-edition box-set called Betrayal at Calth. Both books are also available as non-limited hardbacks, paperbacks, ebooks, and as audiobooks (MP3).
Long considering themselves persecuted by the rest of the Imperium, the apostles of the XVII Legion have courted sedition, betrayal and even open heresy for decades. But for Kurtha Sedd of the Third Hand Chapter, the Word Bearers' assault on Calth has proven...troubling. Drawn into the haunted shadows of the planet's underworld, the Chaplain and his devout brethren must now put aside all other concerns and continue to wage war against the Ultramarines, no matter the ultimate cost.
- The Unburdened by David Annandale