James Swallow
Blood Debt

Inquisitor Ramius Stele is desperate to escape a world being consumed by the dread forces of Chaos. Salvation arrives in the form of Captain Erasmus Tycho and the Blood Angels. But Stele is hiding a deadly secret, and if the Blood Angels discover it, his life – and soul – will be forfeit.
Warhammer 40k
short

Also in:
Blood Angels: the Complete Rafen Omnibus
Sons of Sanguinius: the Blood Angels Digital Collection