King of Spies, Volume 1 — Mark Millar

The world's greatest secret agent has six months to live. Does he die quietly in a hospital bed or make up for a lifetime of bad decisions? He's been propping up an unfair system for over forty years. Now he knows where all the bodies are buried and has nothing to lose as he turns his guns on everyone who ever made a buck as they created the mess we're in right now. Collects King of Spies #1-4