Crouch, Blake. Wayward Pines series #2

Welcome to Wayward Pines, population 461. The town is a modern-day Eden... except for the electrified fence and razor wire, snipers scoping everything 24/7, and the relentless surveillance tracking each word and gesture. Ethan Burke has seen the world beyond. He's sheriff, and one of the few who knows the truth-- Wayward Pines isn't just a town. And what lies on the other side of the fence is a nightmare beyond anyone's imagining