A year after his mother disappeared in her hot air balloon, Seraphin and his father receive a clue that sends them to a Bavarian castle where lurks a force that would stop at nothing to conquer the stars.
- ISBN: 9781626724938
- Published: 2017 , First Second
- Themes: action, Adventure, families, Hot air balloons
- Descriptors: Europe, Fantasy, France, Graphic Novel, Intermediate (ages 9-14)
- No. of pages: 64