After years of absence, Ciro returns home to his mother's bedside. In the Colombian desert of Tatacoa, he meets those he fled and confronts the last guardians of a territory as fragile as it is enchanting.

In 1609, Henry IV sent Inquisition judge Pierre de Lancre to the French Basque Country to investigate witchcraft. In the trials, 80 people were sentenced to death at the stake. Between the 15th and 17th centuries, a total of between 40,000 and 60,000 people fell victim to such waves of persecution in Europe. How can this phenomenon be explained?