Before you is the fourth and final book in the “City of the Sun” series. A series that combines a detective story, a family saga and a thriller. Just seven months ago, students at the Moscow Polytechnic University did not even suspect that they would go to India, then to Sri Lanka, and then cross the ocean and end up in Peru. The desperate journeys of the heroes will end in the rain forests of Latin America. Maxim and his friends follow in the footsteps of the expedition of the Peruvian planter Carlos del Campo and the Russian manufacturer Alexei Zatrapezny, who founded the legendary City of the Sun in the wilds of the Amazon. It is here that the greatest secret of the Chavin civilization will be revealed, which has been protected for centuries by the chosen ones from all over the world. Evgeniy Rudashevsky (born in 1987) is the winner of many awards, including the “Kniguru” and them. V. P. Krapivina. In 2017, his book “The Raven” was included by experts of the International Munich Youth Library in the “White Crows” list. And such recognition is not accidental: his style is recognizable, and his themes are close to modern teenagers and young adults. The author’s calling cards have already become the story about the relationship between man and nature “Hello, my brother Bzou!” and the adventure novel “Solongó. The mystery of the missing expedition." The tetralogy “City of the Sun” continues the theme of growing up, finding oneself and one’s purpose, which is so important for the author.