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 a force that would stop at nothing to conquer the stars lurks.

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...

"When Seraphin, Hans, and Sophie returned from their voyage to the moon, they didn't come home empty-handed--they brought with them aetherite, a miraculous substance that defies gravity. To keep their secret safe from the Prussians, the trio lives in hiding on a remote island in Brittany. Meanwhile, Seraphin's father has founded the International Society of Aether, a group of scientists dedicated to the peaceful pursuit of space exploration. But on...

Sarah is new to the world of Minecraft, so she turns to veteran player Hector for help, but after showing reluctance, Sarah's enthusiasm and all-around energy bring Hector around, and the two become partners and friends.