1800, Joseon (Korea). Homesick and orphaned, Seol is indentured to the police bureau. She has been tasked with assisting a well-respected young inspector with the investigation into the politically charged murder of a noblewoman. The two form an unlikely bond of friendship as they delve into the dead woman's secrets. But when he becomes the prime suspect, Seol may be the only one capable of discovering what truly happened on the night of the murder. In a land where silence and obedience are valued above all else, curiosity can be deadly.