During the Jiading period of the Southern Song Dynasty, Lu Zhaowei, a descendant of a wealthy family, entered the Dali Temple to work in order to find out the cause of his brother's death. In the first case, the "Red Umbrella Bone Case," the skeleton of the deceased was made into an umbrella frame by removing the flesh and blood, and the anniversary of his brother's death was engraved on the end of the umbrella bone. She cooperated with Xiao Yanzhou, a Shaoqing who had lost all sense of smell but was good at identifying poisons, and discovered that there was special cinnabar hidden under the nails of the deceased. As the investigation deepens, they uncover a case of poison testing on a human being that was deliberately covered up by "The Clearing of Innocences", and the fragmentary pages of the brother's autopsy turned out to be the murder guide for the real murderer...
