various
The Silent War
part 37

Across the galaxy, war rages… but while great battle and heroic deeds form the backbone of the war, the conflict extends much further, into darkness and shadow...
The Horus Heresy
anthology

It contains:
Luna Mendax
Army of One
Distant Echoes of Old Night
Wolf Hunt
Templar
The Watcher
Grey Angel
The Sigillite
The Gates of Terra
The Purge
Patience
Lost Sons
Child of Night
Ghosts Speak Not

Also in:
Books 35-37: Unabridged Audiobook Collection