"Only You Can Save Humanity" is a science fiction book written by the talented British writer Terry Pratchett. The first book in the "Johnny Maxwell" series tells the story of a young computer game player named Johnny, who suddenly becomes the main character of this strange fantasy world. During the game "Only You Can Save Mankind", Johnny receives an unexpected message from space aliens who have decided to surrender to him, the boy player. However, Johnny is forced to make an important choice: whether to save the aliens or let them destroy Humanity in a computer game? The author successfully combines comedy with serious philosophical thoughts about war, peace and ordinary people who find themselves in the middle of a global conflict. The book "Only You Can Save Humanity" is of interest to both adult readers and teenagers, will bring many inspirations to the idea and add humor to the worldview.