Asking questions in Ash Harbor can get you killed. Sol Wheat is asking a lot of questions . . . especially after his father vanishes and is accused of murder. Outside the huge domed city, an Ice Age has transformed Earth into an Arctic desert. But inside, the Machine, protected by the Clockworkers—a fearsome police organization—has become the source of the city’s energy and a way for industrial leaders to wield enormous power. When a rogue organization begins posting messages warning of the Machine’s impending failure, civil unrest grows. As Sol begins to uncover the city’s deepest secrets, the Clockworkers start targeting him. Now he’s on the run in Ash Harbor’s underground, where gangs rule and danger lurks in every corner. His life and the survival of Ash Harbor are both at risk. In Oisín McGann’s thrilling adventure, only the truth can help Sol Wheat escape the darkness.