Max and his friends finally fly to Peru. This unique country will most likely be the last point on their journey, if only everything works out as planned. The hero is holding in his hands an ancient figurine of an unknown deity, which should point the way to the mystical City of the Sun. My father spent his whole life searching for this place. He mysteriously disappeared seven years ago, leaving behind a chain of ciphers, riddles and cryptograms. Maxim has already visited India and Sri Lanka, but the solution that seemed close has still not been found, and it is unknown whether the city lost in the Amazon jungle will be found. And in general, did he exist? The tetralogy “City of the Sun” combines a detective story, a family saga and a thriller. In the third book, the reader will find new puzzles, amazing historical and ethnographic details, as well as a wildly twisted plot. Evgeniy Rudashevsky (born 1987) is perhaps the leading authority on adolescent psychology among contemporary Russian authors. The author reproduces the feelings and thoughts of the nineteen-year-old hero as accurately as if he himself had never become an adult.