For thousands of years, the descendants of the ancient people of Wels have kept the sacred relic of the inhabitants of Atlantis. And they will be kept until the time comes, until humanity is ready to accept the priceless gift of our ancestors. No one knows what this artifact is or where it is hidden. Many scientists began to doubt its existence. Many treasure hunters despaired of finding it. Many - but not all. Nadezhda Lebedeva, a St. Petersburg housewife and part-time big fan of detective stories, finds herself at the center of the strange events that took place in the Northern capital. She will have to figure out how the mysterious death of her neighbor is connected with an artifact about which legends are made.