In Lin'an in the Southern Song Dynasty, a case of corpse burning occurred, and there were many doubts. Forensic doctor Shen Yan accidentally passed away and carried an "autopsy comparison book" with him, and he gained insight into traces that were not recorded in the "Resolution of Wrongs". He studied under Gu Jingshan, an old man, and used the tiny bits of ashes to move the iron curtain of the powerful. When the modern method of micro-objects met the iron law of forensics in the Song Dynasty, a criminal investigation that spanned time and space ignited the first ray of light that illuminated the undercurrent of the dynasty among the ashes and bones.
