Cab driver Francis &quot;Chas&quot; Chandler leads an unremarkable existence. His greatest moments have come tagging along with John Constantine -- as a chauffeur. His home life is nothing special, and his beloved London is becoming a soulless metropolis. In middle age, Chas is stuck in a rut. <br><br>But Chas is a master of &quot;The Knowledge,&quot; the elaborate system of routes and landmarks which every London cabbie must memorize. Until now, The Knowledge has been just a tool for Chas. But now, he's about to discover a more sinister significance of The Knowledge. <br><br>An ominous entity from London's grim history has reemerged, and only someone with The Knowledge can stop it. Is Chas up to the task, on his own?<br><br>From the feverish mind of Simon Oliver (THE EXTERMINATORS, GEN 13) with lush artwork by Goran Sudzuka (Y: THE LAST MAN, LADY CONSTANTINE), THE KNOWLEDGE is Chas's chance to make his own mark on the dark universe of HELLBLAZER.