Don Carlos and Giovanni (Green Integer)

These two novels tell the story of Charles Darwin as a young man. A crewmember on the HMS Beagle, the vessel that underwent a worldwide expedition from 1831 to 1836, Darwin discovers the material which enabled him to write The Origin of Species. As opposed to the rational Darwin, Giovanni is a skeptic who has abandoned his Catholic beliefs, but as the story progresses Giovanni becomes more and more rational, while Don Carlos finds himself drawn to the irrational.