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In the last century, when technologies such as cameras and DNA testing were not yet complete, how could the case be solved if a very cunning murderer was encountered? "Detective Grandpa: Ten Deadly Crimes of the 1980s" tells the story of my grandfather, a police officer, who personally solved ten brain-burning crimes in the 1980s. Each story can bring you as much reading pleasure as the best detective novels! Late one night, three people were locked in a closed and locked granary. When they woke up the next day, one of them was hammered to death. The other two seemed to have no motive for the crime. Who was the real murderer? A mysterious blackboard appears on the blackboard of a school, and the handwriting appears to be written by a missing teacher. During the investigation, another school employee died tragically in an abandoned teaching building. What is the significance of the symbols left at the scene? In the early days of reform and opening up, a newly wealthy family was busy preparing for the New Year's Eve dinner, but the next day the whole family was brutally wiped out. The hands of every corpse are missing. Why did the murderer do this? Secret room murders, impossible crimes, supernatural phenomena, local monsters... Follow the pen of Tao Qiuba, the former master of Hupu reasoning, to solve unsolved cases!