Gone

Michael Grant's Gone series begins when everyone aged fifteen and older vanishes without warning from a swath of the California coast, trapping the town of Perdido Beach inside an impenetrable barrier the survivors call the FAYZ. As children develop strange powers and food and order break down, Sam Temple and his rival, his twin brother Caine, become central to the fight for survival against human threats and the monstrous Gaiaphage. Six books (Gone through Light) close the original story; a follow-up Monster trilogy, set years later, follows a new outbreak of mutation-causing powers and a new generation of characters.