From the book, young readers will learn about how over the past 35 years, scientists have discovered the last 15 elements of the table of D. I. Mendeleev. However, the boundary of the periodic system is still a long way off. Physicists suggest that there must be superheavy elements so long-lived that they can be found in the Universe. The reader learns about the powerful installations that physics laboratories build in order to achieve the desired goal - the island of Stability - the habitat of heavy and long-lived elements. A lot of unknown and exciting awaits the discoverers on the way to the superelements!