Exchanging their bodies for machines, these teens will defy expectations, brave danger, and defend civilization. They are The Six.

Adam's muscular dystrophy has stolen his mobility, his friends, and in less than a year it will take his life. Virtual reality games are Adam's only escape from his wheelchair. In his alternate world, he can defeat anyone. Running, jumping, scoring touchdowns: Adam is always the hero.

Then an artificial intelligence program hacks into Adam's game. Created by Adam's computer-genius father, Sigma has gone rogue, threatening to kill Adam--and...