“Putumayo, paradise for the devil. Travels in the Peruvian Amazon region and a description of the atrocities committed there against the Indians" by the author W. E. Hardenburg (Walter Ernest Hardenburg) is a shocking essay about the author's trip to the diamond mines of Putumayo, where he encountered the terrible realities of colonial exploitation of Indians. The book reveals the horrific details of the lives and hardships of indigenous peoples who faced violence, oppression and destruction. The author informs about the painful truth so that the world can learn about how the poorest and most vulnerable sections of society are exploited. "Putumayo, Paradise for the Devil" is a book-testimony that calls for the understanding and protection of human rights and the inviolability of indigenous peoples.