In his novel The Expert's Mistake , Bulgarian Miladin Apostolov revealed shocking truths about the mass executions of Polish officers in Katyn Forest, a topic that was officially suppressed in Bulgaria for years, BGNES reports. The book, published in 1973, highlighted events that had been shrouded in mystery, with the Soviet Union long blamed for the killings, while the official narrative pinned the crimes on Nazi Germany. Apostolov's work came out during a time when such discussions were