With all the clues pointing towards The Outcast recreating the conditions for the Hindenburg disaster, Dan and Amy Cahill split up in order to discover how this can be the case since no one travels by airship anymore.
All eleven-year-old twins Oliver and Celia Navel want to do is watch television, but their explorer father takes them in search of El Dorado, the Lost City of Gold, and their long-lost mother.