Tripods

• The White Mountains
• City of Gold and Lead
• Pool of Fire
• When the Tripods Came (prequel)

John Christopher wrote The White Mountains (192 pages), the first book in this riveting series, in 1967. Elements include alien invasion, loss of free will, fighting against impossible odds. Lots of suspense and intensity. It is not necessary to be a sci-fi fan to be enthralled by this series.

For reviews, go to Amazon, but watch out for spoilers.