Inquisitor Gregor Eisenhorn has spent his life stalking the darkest and most dangerous corners of the galaxy in pursuit of heresy and Chaos, but how long can a man walk that path without succumbing to the lure of the warp? Pursuing heretics in the remote worlds of the Imperium, Eisenhorn must confront the truth about himself. Is he still a champion of the Throne? Or has he been seduced by the very evil that he hunts? The Magos is the brand new, full-length fourth novel in the hugely popular Eisenhorn series. This paperback edition also includes the definitive casebook of Gregor Eisenhorn, collecting together all twelve of Dan Abnett's Inquisition short stories, several of which have never been in print before. These additional stories have been compiled by the author to act as an essential prologue to this long-awaited new novel, while also serving as an indispensable companion to the original Eisenhorn trilogy.