An unhealthy addiction to sugar cubes, a deep-seated fear of water, and universal luxury—these are the simple things that make up 18-year-old Brynn's Utopian existence. Why, then, is her perfect life also plagued with unanswered questions?

Like every other resident of the planet Halcyon, Brynn's home provides everything she needs, money is unheard of, and life is perfect. But unlike the rest of Seaside's residents, Brynn has questions. Why can't people leave the city? Why does the ocean fill everyone with terror? Who are the Workers? Not only is Brynn curious where others are compliant, but she suffers from chronic nightmares of an angelic woman torturing her for information she doesn’t possess. But these are more than just figments of her imagination; they're memories of things that never happened.

When Brynn meets Jonah, a brilliant, library-dwelling boy who shares her questions and her curiosity, they formulate a plan to find answers. Somewhere, the perfect veneer of Halcyon's instant gratification hides a city that only Brynn knows about—a city she and Jonah are determined to find. But will finding the city give them answers, or simply uncover the horrific truth behind the perfection?