Su Jinyao, a former female promotion official in the former dynasty, was forced to remain anonymous because her father was involved in the "Nine Secret Cases" and died unjustly. She used a green hairpin engraved with stars as a mark to sneak into the world of mixed fish and dragons. She possesses the secret technique passed down from her family to investigate cases, and also hides an unknown martial arts skill, just to find out the truth about her father's injustice.
However, the world has long been turbulent, and bizarre murders have occurred one after another in the nine sects: the Wudang Taoist priest died in a secret room, the elder of the Beggar Clan was poisoned by a strange poison, the body of an Emei disciple hangs in the sword tomb... Each case is marked with a strange star pattern, which is exactly the same as the secret case that his father handled back then.
During the investigation, she met Xiao Jin, the left envoy of the Demon Cult, who was both good and evil. He always appeared at critical moments, sometimes helping and sometimes testing. She also met Xie Qingci, the gentle and gentle Kunlun son. He seemed to be open-minded, but there was something unspeakable hidden in his eyes. The identity of the two is a mystery. Are they allies or enemies?
Nine murder cases and nine clues weave into a huge web spanning the rivers, lakes and courts. Su Jinyao used her resourcefulness to solve the puzzle, only to find that there were deeper lies hidden behind every truth, and her father's death was actually closely related to the legendary "Mountains and Rivers Map" that could subvert the world. When people around her reveal flaws one after another, and when she herself is in a desperate situation, can she use a hairpin and wisdom to pierce through the darkness and reveal the final shocking secret?
