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A breathtaking story!

The world is full of amazing things and incomprehensible possibilities... And there are people who are looking for ways to its heights, to the vast space.

In a balloon, Claire Dulac goes to the stratosphere in search of a mysterious source of energy, the aether, and disappears. A brilliant engineer, Archibald Dulac, is sure that he has lost his wife forever, but their son, Seraphin, still hopes for her return.

A year later, they receive a mysterious letter from an unknown person saying that Claire kept a ship's log. They are asked to come to a Bavarian castle where an ambitious young king is waiting for them, who dreams of flying a ship charged with ether. However, the castle is full of dangers, as there are people who will stop at nothing to conquer space.