Thirteen-year-old Will Parker lives in a seemingly peaceful future world where humanity is ruled by mysterious alien machines called Tripods. On his Capping Day, a ceremony where every teenager receives a metal cap to control their thoughts, Will learns a terrifying secret: the caps remove free will. He flees his village with a rebellious friend, beginning a dangerous journey to the rumored last free human settlement in the White Mountains. Their quest is a thrilling fight for freedom against overwhelming odds.