Astoundingly, Constance has found a way back to the place of her origins, New York City in the late 1800s, leaping at the chance, although it means leaving the present forever. Constance sets off on a quest to prevent the events that lead to the deaths of her sister and brother. But along the road to redemption, Manhattan's most infamous serial killer, Dr. Enoch Leng, lies in wait, ready to strike at the slightest provocation. Meanwhile, in contemporary New York, Pendergast feverishly searches for a way to reunite with Constance--but will he discover a way back to her before it's too late?