Some things, once glimpsed, can never be unseen. . . .It was a morning like any other, frigid and gray, when Emily Snow took to the streets of Victorian London to earn the pennies that would keep her and her little brother alive for another day. But a chance turning took her through a dark alley, and there Emily witnessed an extraordinary battle between fierce, tiny creatures no taller than her knee.Now Emily’s life will never be the same, for she can see the world of Faerie. And once seen, she cannot turn away; once engaged, she must join in the latest battle in a war that has been waged for centuries. Doing nothing is not an option, for the Invisible Order—a secret army dedicated to preserving our world against the Faerie—knows about Emily, and its members will do anything to control her. For Emily, her brother William, and their friend, the street thief Spring-Heeled Jack, this winter morning is a turning point, and hereafter their lives will be entwined with the Invisible Order, and with Faerie. . . .