The case led chemical scientist Raffles Howe to the discovery of extreme importance - under the influence of electric current, heavy metals can turn into lighter ones. In this way, he began to produce gold and soon became the richest man in the world. He generously shares money with almost everyone around him, but strange metamorphoses begin to occur with them. This work opens this collection. The book also included a cycle about Professor Challenger. "The Lost World", "Poisoned Belt", "Marakotova Abyss" . The series tells about the amazing adventures of Professor Challenger and his friends. They always went to meet everything new and unusual - whether it was a mountain plateau lost in time and space, where primitive tribes and dinosaurs live, or an unknown gas, which in a matter of hours plunged the entire population of the globe into a stupor. He expresses the most seemingly wild hypotheses, which many call pseudoscientific, such as the fact that our planet is a living intelligent organism. But each time the brilliant mind of the scientist plunges his opponents into the dust with irrefutable evidence and again plunges headlong into another exciting scientific adventure.