Discovering evidence that, during the Horus Heresy, a
rift in the ranks of the Dark Angels led to many Space Marines turning against
the Emperor and becoming known as the Fallen, Sabbathiel is emboldened in her
mission to expose their ancient lies. However, her crew fear her zealousness
will lead to their collective downfall. Meanwhile, as Baltus is inducted into
the Inner Circle of the Dark Angels, his growing doubts surrounding the
faithfulness of his Order cause him to question his understanding of the
universe – even as he pledges to eradicate his corrupted kin. And, faced with
further evidence that the dark-helmed Space Marine Baltus witnessed on Exyrion
has been orchestrating all of the events in the Calaphrax Cluster to date, the
path bends threateningly towards a terrible, inevitable end...
