Humans today spend billions of dollars, with which they could develop countries and end poverty in the farthest reaches of the world, on research to discover whether there is any possibility of life on nearby planets. Scientists spend a great deal of their time and resources on this question. What about living beings that are known to exist right here with us on our earth? No price can be put on the importance of texts of the Quran and authentic Hadeeth that have reached us, giving us knowledge of this matter. Those texts uncover for us the secrets of these fellow-creatures: the world of the jinn.