Gav Thorpe
Raptor

The Raven Guard Raptors discover a derelict Space Wolves ship. Though the vessel appears abandoned, a secret lurks within that threatens to bring the two Legions into conflict.
The Horus Heresy
short

Also in:
Corax
The Horus Heresy Audio Drama Bundle 2015
The Horus Heresy Audio Collection Volume 2
Space Wolves: Ebundle