An epic horror story written by Mike Carey with stunningly visceral art by Leonardo Manco is all here in JOHN CONSTANTINE, HELLBLAZER VOL. 20: SYSTEMS OF CONTROL! When a mysterious worldwide plague starts putting millions of people into deadly comas, Earth's foremost expert on the bizarre, John Constantine, steps in with the "cure," After traveling from the dreary alleys of London to the glittering boulevards of L.A., Constantine realizes that a cadre of wicked demons and hellish monsters is behind the outbreak, and he'll have to sacrifice more than himself to put an end to the nightmare. Includes an amazing softcover edition of the epic horror story written by Mike Carey (THE UNWRITTEN) and Andy Diggle (GREEN ARROW: YEAR ONE). Also collects HELLBLAZER: ALL HIS ENGINES original graphic novel.