Mack Bolan, one-time combat hero of Korea and Vietnam, now a one-man army fighting America's most insidious enemy, discovers a Mafia master plan for total domination of American life in the nightmare bloodbath that is New York.

It is Kosa di tutti Cosa or The Thing of all Things: an operation of impossible dimensions which one man alone could never hope to crush... an operation to be based in the self-professed crime capital of the Western World - Chicago.

And so the Executioner invades the Cosa Nostra nerve-center for a confrontation he knows will be the bloodiest battle of his life...