Seventeen-year-old Zoe Vanderveen is a GAP - a genetically altered person. She lives in the security of a walled city on prime waterfront property alongside other equally beautiful people with extended life spans. Her brother, Liam, is missing. Noah Brody is a natural who lives on the outside. He leads protests against the GAPs and detests the widening chasm they've created between those who have and those who don't. He doesn't like girls like Zoe and he has good reason not to like her specifically. Zoe's carefree life takes a traumatic turn. She's in trouble and it turns out that Noah, the last guy on earth she should trust, is the only one who can help her.