- eBookThe Callisto Group and the Crime of the CenturyMichael Westheim
- eBookThe Callisto Group and the Journey to EarthMichael Westheim
- eBookThe Callisto Group and the Big, Bad WolfMichael Westheim
- eBookThe Callisto Group and the Impending CatastropheMichael Westheim
- eBookSerien: The Callisto SeriesMichael Westheim