Sergey turned to Agatha—the best private detective in town—at the request of his girlfriend Nastya. Nastya works in a bank and suspects that lately something isn’t right there. Not long ago her boss, Inga, died of a stroke, and it looked extremely suspicious, but the police found no elements of a crime in her death. Now Nastya is very worried; she fears for her life. And, as the further events show, her suspicions turn out not to be groundless at all…