After repairing a school bus, the group of survivors split in two, with one group heading to the airport in hopes of reuniting with their parents and saving their dying friend and the other trying to rebuild the community they lost.
Sixteen-year-old Miles and his family must flee their Minneapolis home and begin a new life in the wilderness after a chain of cataclysmic volcanic explosions creates dangerous conditions in their city.
On the post-apocalyptic island of Onewere, Maryam lives a cloistered life, chosen as a young child to fulfill religious duties and join the island's spiritual leader when she reaches puberty--a fate she tries to escape after learning the truth.