Angel of Vengeance: Book 22: Agent Pendergast Series: Douglas Preston, Lincoln Child*Unsigned* A desperate bargain is broken 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 Unknown to Leng, Pendergast's 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