During the Kaiyuan period of the Tang Dynasty, a "shadow puppet murder case" broke out in the west city of Chang'an City. The deceased had no injuries on his body, except for a strange shadow puppet. Supervisory censor {Shen Yan} was ordered to investigate the case, and relied on his photographic memory and super powers of observation to identify suspicious points from clues. On the way to investigate the case, they met Su Ningxue, a heroine with extraordinary skills. The two became connected due to the case and worked together to solve strange cases such as "Poison Hidden in Paintings" and "Rainy Night Nursery Rhymes". As the investigation deepens, the cases all point to Prime Minister Li Linfu. Shen Yan gradually discovers that behind the seemingly independent strange cases, there is a shocking conspiracy to subvert the court. With wisdom as his blade and evidence as his shield, he works his way through the turbulent court, vowing to uncover the truth and uphold justice.
