"In the grim far future, the Inquisition moves amongst mankind like an avenging shadow, striking down daemons, aliens and heretics with uncompromising ruthlessness. Written by Gaunt's Ghosts creator, Dan Abnett, this volume charts the career of Inquisitor Gregor Eisenhorn as he changes from being a zealous upholder of the truth to collaborating with the very powers he once swore to destroy. Part detective story, part interplanetary Epic, this omnibus brings together the novels Xenos, Malleus, Hereticus and The Magos, as well as four short stories."--,(source of summary not specified)