The "Grey Death" is consuming the city, leaving behind a trail of cold, granite corpses. To the Holy Flame Church, it is a witch's curse. To Lillian Wylde, it is a corporate crime fueled by greed. Hidden beneath her apothecary's mask, Lillian uses her forbidden metal-tuning powers to extract toxic mineral dust from the lungs of the dying, erasing the evidence right under the Inquisitors' noses. Linus Clovis is a man of logic and cold steel. As the Church’s most feared "Hound," he is hunting a phantom—a witch who can manipulate metal without a touch. But as the clues lead him to the suspiciously brilliant Lillian, his unshakable resolve begins to fracture. Her scent, her knowledge, and her haunting amber eyes mirror a fragment of his past—the mysterious healer who saved his life when he was at death’s door. When the hunt turns into a conspiracy, the hunter and the prey become an unlikely alliance. Together, they dig into the darkness beneath the noble-owned mines, only to uncover a betrayal from the very heart of the Church. To save the innocent, Lillian must attempt an impossible prison break. And Linus is forced to stand at the crossroads of his life's mission. Does he uphold his oath and arrest the woman he’s grown to protect? Or does he forsake his faith to become her silent accomplice?