This book tells a series of bizarre death cases that occurred in the capital of the Song Dynasty. The deceased had no external injuries or signs of struggle, as if they died quietly in their sleep. The new widower, Lin Xiu, is a young woman who disguises herself as a man. With her excellent autopsy skills, she discovers that the deceased were all poisoned by a rare poison - "Breathless Poison".
As the investigation deepens, she joins hands with Zhao Yu, a relative of the emperor, and gradually uncovers a shocking conspiracy involving palace struggles and changes in imperial power. However, as the truth emerged, she gradually discovered that the killing was closely related to the mystery of her life experience that had been hidden for many years...
