In the Empire of Serast, sunlight is controlled, measured, and sold by the Crown. The poor survive on brief, gray allotments while the wealthy enjoy private hours of full daylight.
Marek Arden, a palace mapmaker, has spent his life documenting the empire's roads, walls, and hidden infrastructure. When his younger brother, Tovin, is executed for stealing an illegal hour of sunlight, Marek discovers a cryptic map suggesting that the sun in the sky is not the real sun. Beneath the capital, the royal family has imprisoned the true source of daylight-and possibly something far more dangerous.
Drawn into a perilous alliance with a rebel prince hiding his identity, a blind dragon-priest, a condemned general, and other revolutionaries, Marek must follow the buried route beneath the palace and uncover the secret behind Serast's artificial daylight. Their quest leads through political betrayal, ancient chambers, rebellion, war, and a truth capable of destroying the empire.