This is the conclusion of the Tripods series written under the name John Christopher. These young adult science fiction stories are set on Earth ruled by the alien Tripods. A prequel detailing the conquest was added 20 years later. The series: 0.5 (Prequel) When the Tripods Came (1988) 1.
Source: OpenLibrary
Tags: Children's storiesScience fictionJuvenile fictionHuman-alien encountersTeenage boysLarge type booksDystopiasExtraterrestrial beingsChildren's fiction
openlibrary_id: OL3972831W
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