Gone by Michael Grant

It starts as a normal day, then every person older than 14 vanishes as an invisible wall traps the survivors within a small California town. Without adults, the internet, or any contact with those outside of their town, the large cast of characters quickly devolves into two factions struggling for control before they hit their fifteenth birthday and disappear themselves. And if that wasn’t enough, most of the kids suddenly develop unique abilities and the animals trapped within the dome begin mutating. Gone is a high-paced novel—and the first in a phenomenal series—that weaves together numerous stories of kids fighting to survive in a town they barely recognize.