In the midst of social and political upheaval, a voice rises on the mountain, launching a message of peace and non-violence. His voice was silenced, his words were denounced. This humble thinker has touched the lives of millions of people in the world. How is it still the best kept secret in the Andes? For some it is the thinker who promoted a spiritual and political movement that overcame the borders and spread from Argentina to India. For others it is the leader of a sect, a skilled manipulator and demagogue. For most, it remains a mystery. Through this feature-length documentary we propose to narrate the life and work of this unusual character, posing the disturbing question: who is Silo?