FBI Special Agent Pendergast and Constance Greene take a final stand against the deadliest serial killer in the history of New York: Pendergast's own ancestor, Dr. Enoch Leng. The latest thrilling timeslip adventure in the New York Times-bestselling series from Preston and Child.

A desperate bargain is broken...

Having travelled back in time, Constance Greene confronts Manhattan's most dangerous serial killer, Enoch Leng, bartering for her sister's life - but she is betrayed and turned away empty-handed, incandescent with rage.

A clever trap is set...

As Agent Pendergast focuses on the unstable Constance in her fanatical quest for vengeance, his brother Diogenes appears unexpectedly, offering to help for mysterious reasons of his own. Disguised as a cleric, Diogenes establishes himself in New York's notorious Five Points slum, watching Leng's every move... and awaiting his own chance to strike.

A vengeful angel will not be deterred...

But Constance strikes out on her own, to rescue her beloved siblings from a tragic fate and take savage retribution on Leng. Yet Leng is one step ahead... and has a surprise for them all.