The White Mountains (The Tripods, #1)

Long ago, the Tripods—huge, three-legged machines—descended upon Earth and took control. Now people unquestioningly accept the Tripods' power. They have no control over their thoughts or their lives.

But for a brief time in each person's life—in childhood—he is not a slave. For Will, his time of freedom is about to end—unless he can escape to the White Mountains, where the possibility of freedom still exists.