Among the Hidden
Margret Peterson Haddix
In this book, the setting could be anywhere in the world on a farm. Luke is a shadow child, a third child forbidden by the population police. He had a normal life then, the government started cutting down the woods around them. Luke now had to hide from the government for the rest of his life. One day he sees a girl's face in a window of a house where he knows two other children already live. Jen is willing to risk everything to leave the shadows. He doesn't take part in her dangerous plans and Jen dies because the government shoots her. In the end the government finds Luke and he has to go live in a school for boys.