Pendergast's brother, Diogenes, disguised as a cleric, establishes himself in New York's notorious Five Points slum, manipulating events like a chess master, watching Manhattan's most dangerous serial killer, Enoch Leng's every move...and awaiting his own chance to strike. Meanwhile, as Pendergast focuses on saving the unstable Constance Greene in her fanatical quest for vengeance, she strikes out on her own: to rescue her beloved siblings from a...