Main Characters : Isaac Newton, Karen, Galileo Galilei, Mary Wollstonecraft What is it about ? Isaac Newton and Galileo Galilei was scientist who after four years became serial killers that work for an organization called the Burning Skull. Why are the main character's important ? Karen - Just a assistance/ bad - ass killer . hacker.  Galileo Galilei - mathematician/scientist/serial killer Isaac Newton - mathematician/scientist/serial killer Thomas Hobbes - Boss of agency, Burning Skull