As Xavier Barbeau hangs suspended in Jupiter’s deep atmosphere hunting the legendary Blubberalla, Philbert Edward Glass and Dr. Anias Ambercrom are attacked by kite creatures onboard the HMS Jover. Afterwards, as they continue their journey, Philbert’s compass starts to spin wildly, and they spot what must be the Lodestone, drifting in the clouds. However, after boarding the alien ship, the sky whalers quickly discover they are not alone.