Diagnosed with breast cancer, Margaret De Wys journeyed deep into the Amazon to work with Carlos, a charismatic Shuar shaman and master of medicina milenaria, an ancient tradition with a precise technology of healing. Carlos guided her into a world of visionary plants, ritual purification, and miraculous healings, including the complete disappearance of her cancer. De Wys's story provides an inside look at the ayahuasca ceremonies and the ways this spiritual medicine can heal the emotional origins of disease.