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The novel The Chrysalids starts out when the main character, David is having a dream. The dream is about a city with flying objects in the sky and buggies without horses to pull them. After this dream David is curious of what this city is. He realizes he has the gift of telepathy. He and the others with telepathy must keep it a secret or they will be banished to the fringes. After some time he has a baby sister that has very strong telepathy. The group later gets found out and they are forced to seek refuge in the fringes. Petra, David's little sister starts communicating with a lady from a place called Sealand. The people from Sealand then come to save them. Near the end of the novel the Sealand people arrive and save them. When they finally arrive in Sealand David realizes that the dream he had was of Sealand. .
The story "By the Waters of Babylon" is about a young man named John. He is the son of a priest in his community. He ventures off into the dead places. While sleeping in an old building from the old people, he has a dream. It is about a city with bright lights and funny looking objects. He then seeks out this city of the gods. On his quest he finds the truth, about the old people. They did not have magic but they had technology instead. John brings back the news and tells his father. His father accepts the truth and they slowly tell their community. .
The Chrysalids and "By The Waters Of Babylon" also have many similarities in plot. The main character in both stories travels to forbidden lands. Also the main characters were both sons of highly respected men in their communities. Both of the characters end up with a better life in the end. Both characters have dreams about the truth which makes them go on quests. .
These novels had some differences in plot as well, but not too many. One main difference is that the societies view dead places differently. Waknuk views dead places as a place of the devil in comparison to The Hill People who view dead places as a place of the gods.