Myah Bearchild is an aboriginal and is a member of the Cree people. She's living in the corridor with her twin brother Silas and her father near what used to be Victoria island. The entire earth has flooded and the corridor is a government monitored area where they can keep a close eye on the aboriginals. You see when the great flood occurred, some defying force formed a barrier around each and every native person and some other people who were close by them. The government thinks the natives caused this and would like to keep the aboriginals under their thumb, but whispers say of the band of wild Indians coming back to rescue their brothers and sisters. Myah and her brother think its just a rumor used to scare the government until the aboriginals in the corridor rise up and when Myah and Silas are in danger, their father takes them to a place where they will be safe and learn to live the old way. That place is where the band of wild Indians live, that place is the boundary.