City of Ember meets The Goonies in the final novel in an exciting series full of fascinating science and thrilling adventure from acclaimed author Diana Peterfreund.Gillian Seagret thought she knew everything about the secrets of Omega City, the mysteries of the rocket scientist Dr. Underberg, and the evil conspiracies of the organization called the Shepherds. But she’s about to learn that uncovering the truth is the easy part. You also have to fight for it.
Now Gillian’s father has been taken captive, and she and her friends are trapped in the Shepherds’ hidden base. The only person who can help them is a rogue Shepherd, but she has plans of her own, and no one — least of all Gillian’s mother — is sure they can trust her.
New clues into Underberg’s past lead them back into an utterly transformed Omega City and farther than they ever imagined, into outer space. There, Gillian, Eric, Savannah, and Howard discover the Shepherds’ most precious secret, and they realize there’s more at stake than simply their family and Underberg’s legacy... they also have to save the world.