I loved Oppel's Airborn. I describe it as shades of Titanic (in the air) with a touch of Mysterious Island and Pirates of the Carribean thrown in. In this sequel, Oppel takes us back to the world of graceful hydrium ships and into a search for gold.
As a Paris Airship Academy cadet, Matt Cruse is serving on a rust bucket freighter when the crew sights a long-vanished phantom ship, the Hyperion. Like the Flying Dutchmen of shiplore; the Hyperion is more rumor than fact. The ship is at an unreachable altitude but Matt's captain is foolishly determined to capture it. As the crew falls victim to the crushing altitude, Matt is able to save their lives by disobeying a direct order from his captain.
Back in Paris after this episode Matt is wondering if he has a future at the Academy or with the lovely Kate de Vries. Kate wants to prepare an expedition to find the Hyperion though she is more interested in scientific discoveries than the legendary treasure.
Matt alone knows the the ship's last position and others want his knowledge. Should he let the dream of wealth overtake him and join in the hunt for the Hyperion or should he plug away at his studies and forget the whole thing?
Like treasure hunters searching for Spanish galleons at impossible ocean depths, the team will have to break the sky in their quest. A beautiful gypsy girl, a privateer with questionable motives, a prim governess, brilliant Kate and brave but confused Matt make up the party and are in for the flight of their lives.
As Kate suspects, there are other lethal creatures in the sky besides cloud cats. The other presence in the story is the Captain Nemo/Howard Hughes-type eccentric who built the Hyperion so many years ago. Is his spirit ready to part with the secrets of the ghost ship?
Horation Hornblower meets Jules Verne -- this is a cracking read. I hope Oppel will visit this world again. His fascination with bats continues by the way.

