The forbidden fortress / Diana Peterfreund.
Though Gillian and her friends were the ones to find the lost doomsday bunker, no one seems to care about their thoughts on the whereabouts of its creator, Dr. Underberg, or learning the truth about the Shepherds, a mysterious group that will stop at nothing to keep Underberg -- and Omega City -- a...
New York, NY :
Balzer + Bray, an imprint of HarperCollins Publishers,
|Series:||Peterfreund, Diana. Omega City (Series)
Walker Library - Curriculum Collection - Juvenile - 3rd Floor
Pull and Hold