Daineka has always been skeptical about fortune-tellers and, just for company, visited Madame Judith’s parlor to support her friend Olga. She never imagined that a visit to a clairvoyant would set off an entire chain of strange, inexplicable, and frightening events. Madame Judith promised that Olga would soon see her husband—the one who disappeared three years ago—and that, unexpectedly, he appeared on the screen in a popular TV series! The girls’ attempts to figure out how he is connected to the filming led them to a mysterious Blue Stone, which, according to legend, rose from the bottom of Lake Pleshcheyevo. On the shore, Daineka and Olga found a dying girl. But how is she connected to Sergei’s disappearance? You can understand it only by unraveling the mystery of the Blue Stone…