Tally lives in a world where your 16th birthday brings aesthetic perfection: an operation that erases all your flaws, transforming you from an "Ugly" into a "Pretty". She is on the eve of this important event and cannot wait for her life to change. As well as guaranteeing supermodel looks, life as a Pretty seems to revolve around having a good time. But then she meets Shay, who is also 15 - but with a very different outlook on life.

Frey and Rafi are inseparable.... two edges of the same knife. But Frey's very existence is a secret. Frey is Rafi’s twin sister - and her body double. Their powerful father has many enemies, and the world has grown dangerous as the old order falls apart. So while Rafi was raised to be the perfect daughter, Frey has been taught to kill. Her only purpose is to protect her sister, to sacrifice herself for Rafi if she must.

Don't call them heroes. But these six Californian teens have powers that set them apart. Take Ethan, aka Scam. He's got a voice inside him that'll say whatever you want to hear, whether it's true or not. Which is handy, except when it isn't - like when the voice starts gabbing in the middle of a bank robbery. The only people who can help are the other Zeroes, who aren't exactly best friends these days.

It is the cusp of World War I, and all the European powers are arming up. The Austro-Hungarians and Germans have their Clankers, steam-driven iron machines loaded with guns and ammunition. The British Darwinists employ fabricated animals as their weaponry. The Leviathan is a living airship, the most formidable airbeast in the skies of Europe.

Rowan is a Second Child in a world where population control measures make her an outlaw marked for death. She can never go to school, make friends, or get the eye implants that will mark her as a true member of Eden. Her kaleidoscope eyes will give her away to the ruthless Center government.