How can you stop a serial killer who has been dead for a hundred years? The nail-biting new thriller in the #1 New York Times bestselling Agent Pendergast series. FBI Special Agent A.X.L. Pendergast always wants to protect his protegee Constance Greene from harm. But, against all odds, Constance has found a way to travel back in time to New York City in the late 1800s to embark on a dangerous quest: to stop the era's most infamous serial killer, Dr. Enoch Leng.