Michael Scanlon
Descent of Angels
part 6

As the mighty Lion El’Jonson strives to unify his feudal home world of Caliban, the coming of the Imperium brings a new destiny – and new division – for his knightly followers.
The Horus Heresy
novel

Also in:
Dark Angels: the Story So Far
The Novels: Volume Two
Books 4-6: Unabridged Audiobook Collection