Sandy Mitchell is the pen-name of Alex Stewart, a British SF writer best known for his Warhammer 40,000 Ciaphas Cain HERO OF THE IMPERIUM!
novels. He also wrote the Dark Heresy
novels Scourge the Heretic
and Innocence Proves Nothing
, featuring an inquisitorial team known as the "Carolus Angelae"
put together by Inquisitor Carolus Finurbi.