Until about ten years ago, the Mashco Piro people were only known from photographs taken during overflights of Peru's Manu National Park, one of the most biodiverse rainforests on earth. Then they began to show themselves. They raided settlements in search of machetes, pots and plantains, while missionaries and indigenous pioneers, who saw the Mashco Piro as a brother people, tried to make contact. After the Mashco Piro murdered two people, the Peruvian Ministry of Culture decided to enter into a dialogue with the Mashco Piro in a project that was unique in the world. A team of anthropologists and indigenous people is to find out whether the Mashco Piro really want contact and at the same time inform them that the world on the other side of the river follows different rules and poses an existential threat to them. The film follows this project over five years, which ultimately confronts the question of what it means to be "civilized" and whether a radically different way of living can remain untouched by the modern world. Sensitive and giving voice to all those involved, Carl Gierstorfer's documentary documents the contradictions that the indigenous peoples of the Amazon face on a daily basis. The question of the future of the last isolated peoples thus becomes the question of how we want to shape our own future.