Résumé: The fourth one-shot, illustrated by Frank Quitely, Pax Americana: In Which We Burn takes place on Earth-4 and features characters from Charlton Comics. It has been described by Morrison as "if Alan Moore and Dave Gibbons had pitched the Watchmen now, rooted in a contemporary political landscape." Rather than the Cold War focus of Watchmen, the title's focus will be international terrorism and conspiracy in a world of superheroes. The story will be told with an 8-panel grid, similar to Watchmen 's 9-panel grid layout. The story is based around musical harmonics, as each world in the Multiverse vibrates at a different frequency, with Quitely explaining, "music, and vibration… musical vibrations, the octave, the eight as a repeated motive, and creating patterns leading the eye around the page in a specific way." Morrison describes Pax Amaricana as his Citizen Kane. The Captain Atom of this universe had been introduced in Final Crisis as his world's analogue to Superman. Morrison describes The Question as "a little bit like Rorschach but absolutely nothing like Rorschach." Peacemaker is described as a good guy, but assassinates the President of the United States. The story revolves around the assassination, and the failures on part of the Charlton characters.