John Christopher 
Tripods: The City of Gold and Lead [EPUB ebook] 
Book 2

Will Parker and his friends have escaped the mind-controlling alien Tripods, and found sanctuary in the White Mountains – but when an opportunity arises for them to infiltrate a Tripod city, they realise they have a chance to strike back against the invaders. What they learn there may hold the key to liberating humanity – if they can survive the beauty and terror of the City of Gold and Lead.The second book in John Christopher’s classic dystopian series is available for the first time as an ebook.