"The City of Gold and Lead" is the second book in the Tripods series by John Christopher. It follows the journey of Will Parker and his friends as they explore a mysterious city ruled by the alien Tripods. The story delves into themes of freedom, control, and the struggle against oppression. In the city, the characters encounter a society that appears prosperous but is ultimately deceptive. The inhabitants are manipulated by the Tripods, who maintain power through fear and subjugation. Will and his friends must navigate this dangerous environment to uncover the truth and find a way to resist their captors.