The Master Key. An Electrical Fairy Tale Founded Upon the Mysteries of Electricity (en Inglés) - by L. Frank Baum

The Master Key: An Electrical Fairy Tale by L. Frank Baum is a science-fantasy novel that blends imagination with early technological curiosity. It follows young inventor Rob Joslyn, who accidentally summons the Demon of Electricity and receives a series of extraordinary electrical gifts. As Rob tests these inventions through global adventures, he confronts their power and consequences. Ultimately, he realizes humanity is not ready to use such advanced technology responsibly. The story explores innovation, ethics, and optimism about scientific progress, offering a visionary tale that anticipates future technological developments while emphasizing wisdom and restraint.