A civilization closed off from the outside world that is known as the Municipality is made up of people who have long forgotten how they even came to the city. The people are isolated from the world and pressured to segregate themselves into two communities- the mezmires, who develop Abilities in their youth due to a genetic modification- and the normalems, who have none to speak of. The Municipality's history is stained by the blood of innocent normalems under the long tyranny of the mezmires, and the blood of innocent mezmires during the Insurrection. The Insurrection's fiftieth anniversary is fast approaching when fourteen-year-old Lien Ki, known as Anj by friends and acquaintances, a mezmire, disappears, and two of her best friends, mezmires Skye Chetwynde and Lucas Slora are who the authorities point their fingers at. Skye, Lucas, and Anj's friend circle begin an investigation to find their friend, struggling to prove themselves innocent in a civilization that is unforgiving to mezmires for their past cruelty to those born normal. As their investigation continues, they realize that to discover the truth, they will have to go back past a time that no one wants to talk about, to a time no one alive remembers.