At a time in the future, when having more than two children is illegal, 12-year-old Luke Garner is a third born, a shadow child-his very existence punishable by death. He spends his whole life hiding and knows only his immediate family. Luke is forced spending days and nights in his attic room. He discovers Jen, another third child, who is as bold as Luke is timid. She makes Luke imagine a life of freedom. But at what cost?