In the book, Gone, by Michael Grant, Sam and his friends are some of the last kids on earth. Everyone they know over fifteen has suddenly disappeared. They have to find a way to work with each other and the rest of Perdido Beach.
Sam and Astrid go looking for their parents and other adults. They don't find any adults but instead find a mysterious barrier.
One of the characters, Astrid, is in a grade above.
The older kids and teacher vanished out of thin air.
Caine, Sam's lost brother, and the kids from Coates take control of Perdido Beach. Sam finds out about his power.
All of the other kids experienced the same thing. Sam and Astrid don't know what to do.
Sam and Astrid are getting chased by coyotes. They find a girl named Lana that helps them to safety. Lana heals their wounds with her special power.