The story starts with a comet that touches the Earth in its flight and collects a few small chunks of it. Some forty people of various nations and ages are condemned to a two-year-long journey on the comet.
Jack and Mark build an airship and head North, hoping to find a rare plant that grows only in Alaska. But a freak earthquake causes a chunk of the Earth, along with our protagonists, to fly into outer space.
The book centers around the life of Otto, the son of a German warlord. His mother dies when she sees her husband hurt, prompting his father to take his newborn son to a nearby monastery to be raised. When Otto...