civilization, subterranean

"This is the story of mankind clawing for survival, of mankind on the edge. The world outside has grown unkind, the view of it limited, talk of it forbidden. But there are always those who hope, who dream. These are the dangerous people, the residents who infect others with their optimism. Their punishment is simple. They are given the very thing they profess to want: they are allowed outside"--Back cover.

Armed with secret knowledge, Juliette, now mayor of Silo 18 and her crew set out to rescue a world she hates but now understands better -- the world of the Silos with its rigid rules and terrible consequences for disobedience.

The outer crust is under attack by the subterranean Styx who are turning ordinary humans into walking bombs and incubators for their eggs, and only Will Burrows and his band of retired commandos stand in their way, but the Styx also have problems of their own.

Will Burrows believes he is safe at the very center of the earth, in a world that no one knows exists, but the Styx are close behind and will follow him anywhere, while on the surface, Drake and some unlikely allies unearth some critical secrets.

Examines remnants of earlier civilizations, such as catacombs and aqueducts, uncovered beneath some of the world's major cities.

In a toxic world, a community lives underground, when Sheriff Holston asks to leave and go outside, mechanic Juliette is appointed as the new sheriff and learns how badly her world is broken.

The outer crust is under attack by the subterranean Styx who are turning ordinary humans into walking bombs and incubators for their eggs, and only Will Burrows and his band of retired commandos stand in their way--but the Styx also have problems of their own.

Although both know it is forbidden, Amy and Axel hope that by following the countless ramps leading upward they can escape from their filthy subterranean world.