'Childhood's End' (1953) by Arthur C. Clarke

The story follows the peaceful alien invasion of Earth by the mysterious Overlords, whose arrival begins decades of apparent utopia under indirect alien rule, at the cost of human identity and culture.

Clarke's idea for the book began with his short story "Guardian Angel" (published in New Worlds #8, winter 1950), which he expanded into a novel in 1952, incorporating it as the first part of the book, "Earth and the Overlords". Completed and published in 1953, Childhood's End sold out its first printing, received good reviews and became Clarke's first successful novel. The book is often regarded by both readers and critics as Clarke's best novel and is described as "a classic of alien literature". Along with The Songs of Distant Earth (1986), Clarke considered Childhood's End to be one of his favourites of his own novels.