"The Moon Maid" by Edgar Rice Burroughs is a science fiction novel written in parts between 1919 and 1922, published in 1926. When humanity reaches the Moon following decades of global war, they unknowingly unleash catastrophe upon Earth. A treacherous Earthman allies with the tyrannical Kalkars, moon-dwelling oppressors who invade and conquer the planet. Spanning generations, this three-part epic chronicles Earth's fall from technological civilization to feudal darkness, and the struggle to reclaim freedom from brutal occupation. (This is an automatically generated summary.)