A serial disappearance case that was unsolved ten years ago was brought to light thanks to a yellowed letter. Shen Zhaoning, a former criminal investigation consultant who had been silent for many years, and Pei Yansheng, a low-key archive restorer, were forced to join forces to uncover the layers of hidden truth. Lin Xiu's perfect testimony, Lu Huai's silent relic, Su Wantang's persistent pursuit, and Qiao Zhiqiu's secret betrayal are all stairs leading to hell. When the ink on the page began to speak, they understood - some truths are never meant to be discovered, but to be forgiven.
