Title: The pool of fire
First published: 1968
Description: 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. The White Mountains (1967)
2. The City of Gold and Lead (1967)
3. The Pool of Fire (1968)
Subjects: Children's stories, Science fiction, Juvenile fiction, Human-alien encounters, Teenage boys, Large type books, Dystopias, Extraterrestrial beings, Children's fiction
People: Tripods