"Childhood's End" is a science fiction novel by Arthur C. Clarke that explores the arrival of mysterious alien beings known as the Overlords. They come to Earth to oversee a peaceful transition into a utopian society, eliminating war, poverty, and suffering. However, their presence raises questions about humanity's future and identity. As the story unfolds, humans begin to evolve into a new form of existence, guided by the Overlords. This transformation leads to the end of human childhood, symbolizing a loss of individuality and freedom. The novel ultimately examines themes of progress, sacrifice, and the nature of humanity.