How do you stop a serial killer who has been dead for a hundred years? The chilling time-travel thriller from the New York Times bestselling authors.

FBI Special Agent A. X. L. Pendergast always wants to protect his protégée Constance Greene from harm. But, against all odds, Constance has found a way to travel back in time to somewhere not even Pendergast can help her.

Heading back to the Victorian-era New York City of her youth, Constance embarks on a dangerous quest: stopping infamous serial killer Dr. Enoch Leng from bringing his nefarious plans to fruition.

If Constance can stop Dr. Leng, she can prevent the shocking deaths of her sister and brother... but trapped outside her own time, will she survive taking on one of the cleverest and most evil men of his age?

'Simply brilliant!' Lisa Gardner on Preston & Child