Book "Izolda 9 & ChatGPT 3: The Secret Passage" was written by a 9-year-old girl in 7 days with the help of AI. It contains over 11,500+ words and showcases 63 illustrations that were generated using AI technology. The book follows Princess Izolda, a young girl living in a kingdom nestled in the mountains, who discovers a secret door in her castle chambers. With curiosity and excitement, she embarks on a journey through a dimly-lit passage, encountering unexpected obstacles and mysterious sights along the way.