The Traitor's Key

Sunny Mavis has lived her whole life in the Gut, a city for misfits beneath the perfected New York. She works in the subterranean factories, frequents the black markets, and holds to the legend speaking of unlikely heroes who will end the totalitarian suppression. Just like everyone else.
Nero survives as a Pirate in the tunnels, trying his best to fly under clan leader Malcolm's radar by participating in clan raids on Gut territory. He is hiding deadly obsessions, however. Obsessions with light, life, and finding the Way Out.
Soldier 7265 is a military machine with a hidden defect: he can think for himself. To avoid being decommissioned, 7265 escapes his remote army base, but not before learning deadly secrets about the Society, secrets that certain people will do anything to keep hidden.
Bane and Beatrice Hart are the perfect siblings. Physically flawless, impeccably fashionable, and the toast of their societal circles. At least, that's how it appears. They're secretly trying to contact the Gut using illegal communication devices in an attempt to catch a glimpse of the world hidden beneath theirs, and to find out the truth behind Society's perfect facade. After all, they know better than anyone that perfection is impossible. There's always something ugly underneath.