John Christopher 
City of Gold and Lead 

Will and his friends return to the City of the Tripodsand risk their livesin this second book of a classic alien trilogy ideal for fans of Rick Yanceys The 5th Wave and Margaret Peterson Haddixs Shadow Children series.When Will and his friends arrived at the White Mountains, they thought everything would be okay. Theyd found a safe haven where the mechanical monsters called Tripods could not find them. But once there, they wonder about the world around them and how they are faring against the machines. In order to save everyone else, Will and his friends want to take down the Tripods once and for all. That means journeying to the Tripod capital: the City of Gold and Lead. Although the journey will be difficult, the real danger comes once Will is inside the city, where Tripods roam freely and humans are even more enslaved than they are on the outside. Without anyone to help him, Will must learn the secrets of the Tripodsand how to take them downbefore they figure out that hes a spyand he can only pretend to be brainwashed for so long.