The Tripods

Synopsis:

A race of aliens who move around in huge three-legged machines have enslaved the Earth. Every adult is fitted with a cap which renders them subservient to the aliens. A group of humans are immune to the capping process and form a resistance. In the three books of this trilogy (The White Mountains, TheCity of Gold and Lead, The Pool of Fire) a group of youngsters travels from Britain to France, infiltrates the aliens' base and destroys their power source.