Omega City

Seeking to prove her father is not a mad conspiracy theorist, Gillian Seagret, her brother Eric, best friend Savannah, and NASA-obsessed schoolmate Howard uncover the secret doomsday bunker of Dr. Alysius Underberg, a Cold War-era rocket scientist. Exploring the bunker, which is called Omega City, the four friends learn they are not alone, and before they know it they are in a race to find the answers to Dr. Underberg's questions, before Gillian's father's enemies get a hold of them first.