Thirty years ago, the "Hongfengling Massacre" on the outskirts of Qingchuan shocked the whole city: three forest rangers mysteriously disappeared from their cabin in the forest, leaving only a mess of blood and half a blur of fingerprints at the scene. The police investigated for several years to no avail, and the case eventually became a mystery. Thirty years later, a rare heavy rain washed away the Hongfengling Mountains, revealing a skeleton buried deep underground. The bronze cigarette holder and bloody hemp rope next to the skeleton became the only "silent witnesses."
Trace appraiser Lin Yan was assigned by his superiors to reopen the case because he was good at digging out hidden clues from physical evidence. She took the magnifying glass and old case files left behind by her grandfather and went to Hongmaple Ridge for on-site investigation. As the bones were identified, fingerprints compared, and physical evidence traced further, she discovered that the skeleton was not that of any of the three missing rangers. The special patterns on the bronze cigarette holder and the weaving process of the hemp rope were closely related to another unsolved case of her grandfather's past.
