In the prosperous Yin Dynasty, mysterious unsolved cases keep emerging in Chang'an, accompanied by hidden power disputes in the royal court.

Fifteen years ago, the Shen family suffered a devastating unjust disaster, and only the young lady Shen Qingci escaped safely. She concealed her real identity, devoted years to learning ancient forensic autopsy knowledge, and disguised herself to join the Dali Temple, becoming the first female forensic investigator in the dynasty.

She uses professional bone and corpse identification skills to restore case truths, uncover hidden secrets behind strange events, and expose false disguises of powerful nobles.

The young minister of Dali Temple, Xiao Linghan, also carries the grievances of his family. After discovering Shen Qingci's true identity, he chooses to protect her silently. The two gradually trust each other, join hands to investigate bizarre paranormal cases one after another, including eerie wedding mysteries, strange painting incidents, hidden river secrets and palace strange events.

All mysterious clues point to a huge hidden conspiracy in the court. With forensic evidence and fair laws, they dig out the hidden truth step by step, guard the peace of Chang'an, and write a legendary story of justice and fate.