Blood on the Coal. Shadows of Coal, #1

The Gray City runs on coal, breathes ash, and pays for its progress with the lives of the invisible poor. In the Ash Quarter, death is a daily occurrence, easily ignored by the authorities. But when Margaret Kane is found murdered in her home, her death leaves behind more than just grief. Above her body, drawn in charcoal, is a strange symbol: a broken circle with an eye in the center. The police dismiss it as a robbery gone wrong, but Margaret's son, Thomas Kane, sees what they refuse to-a calculated execution.
Born of soot and shadow, Thomas possesses a brilliant mind capable of seeing patterns others miss. Refusing to let his mother become just another statistic, he launches his own investigation. His hunt leads him from the grimy docks to the city's elite merchant districts, unraveling a terrifying conspiracy. Beneath the industrial smoke lies a secret facility conducting experiments on human consciousness-and a "Gray Brotherhood" willing to kill to keep their secrets buried.
Thomas must transform from a grieving son into a relentless hunter. In a city built on silence, the most dangerous weapon is the truth.