The novel follows the life events of the main character, Pietro Garau, since the years of his enrollment at the University of Urbino till the end of the drammatic and unexpected events, that start at the beginning of the narration in a not-too-distant future.The frame in which Pietro's human and sentimental events unravel, in which Giovanna initially stands out when he was at university and later Yuan does, chinese girl that between Assemini (Cagliari) and Gutturu Mannu will later become his spouse, is the landscape of all the great events that happen in Italy and in the world in those years.In his father's land, located in the Gutturu Mannu valley, Pietro spends some of his time trying to craft a strange sculptural project and one day, in a cave near Monte Lattias, he discovers a strage black stone that, with other he will later become aware of, marks the beginning of a legend that will be crucial to avert the grave danger that looms over humanity