"The Master Key: An Electric Fairy Tale Built on the Secrets of Electricity" is a book written by L. Frank Baum, the author of the world-famous "Wizard of Oz." Philosophical reflections and scientific discoveries are skillfully combined in this fantastic work. The main character, student Six, meets an inventor who has high hopes for electricity and studying its secrets. Going together on this exciting journey into the world of electricity, they encounter wonderful adventures and mysterious inventions. "The Master Key" is not only a book for children, but also an exciting and well-known fairy tale for readers of all ages, which will leave an unforgettable impression on you and open new horizons in the world of science and technology.