The story takes place in the ancient capital and revolves around Lin Yu uncovering the conspiracy behind the royal dyeing bureau. During the investigation, Lin Yu discovered that the Minister of Industry had a suspicious connection with the killer leader, which further implicated the secret contacts between the Ministry of Industry and the dye house in the capital. In the process of tracking the truth, Lin Yu encountered a plot, but received help from the mysterious woman Ye Han. At the same time, Su Yao and Shopkeeper Wang were looking for a miracle doctor to rescue the poisoned young craftsman, and accidentally got involved in a more complicated situation. As the investigation deepened, Lin Yu and others discovered that all of this was inextricably linked to the imperial concubines in the palace. Undercurrents in the capital were surging, and a storm related to life and death was coming. This book is full of suspense and reversals, depicting the thrilling journey of the protagonists searching for the truth in the whirlpool of intrigue and conspiracy.