One of the last secret, underground human cities is facing total annihilation and its leader-John Constantine-must plan a suicide mission to assassinate a key lieutenant in the vampire empire! Against unreal odds and with an unlikely team including Booster Gold, Deathstroke, and Mary Marvel, does the Hellblazer have one more trick up his sleeve? A gritty, violent, monochromatic companion series to DC vs. Vampires!
— Description from Comic Vine community (comicvine.gamespot.com).
