"On the aethership's maiden voyage, Seraphin and the Knights of Aether had prepared for everything--except treason. The villainous chamberlain wants to overthrow King Ludwig and claim the electro-aetheric technology for Prussia. The only escape for the king and his companions lies in the frosty skies above Bavaria. The ship's first flight is a success, but their respite is short-lived. As long as the chamberlain is free to spread his lies, these travelers will find no safe harbor. To save the king's throne, they must push the ship even farther--out of the sky . . . and into the stars!"--OCLC.

Translation of: Le château des êtoiles.