Will Parker never dreamed he would be the one to rebel against the Tripods. With the approach of his thirteenth birthday, he expected to attend his Capping ceremony as planned and to become connected to the Tripods--huge three-legged machines--that now control all of Earth. But after an encounter with a strange homeless man called Beanpole, Will sets out for the White Mountains, where people are said to be free from the control of the Tripods.

But even with the help of Beanpole and his friends, the journey is long and hard. And with the Tripods hunting for anyone who tries to break free, Will must reach the White Mountains fast. But the longer he's away from his home, the more the Tripods look for him...and no one can hide from the monstrous machines forever.