In David Kocieniewski's The Brass Wall comes a brilliantly reported true story of power and betrayal in the NYPD set against the worlds of the Mafia and big-city politics

In 1993, Vincent Armanti, Undercover Detective #4126, agreed to infiltrate the branch of the Lucchese family responsible for the homicide of a beloved fireman. Already a legend for successfully posing as a hit man and arms smuggler, Armanti transformed himself into Vinnie "Blue Eyes" Penisi--a veteran hood with an icy stare. Yet, once under cover, Armanti found that the wise guys he was chasing had access to classified police information. Stakes accelerated when the informant was revealed to be the son of the commander of NYPD's Internal Affairs Bureau. Again and again, IAB's detectives compromised Armanti to protect the powerful man's son, but even the police commissioner ignored the situation. Like the fireman who took an oath to serve, Armanti stayed on the job, even when it was clear his life was in danger.

Kocieniewski, former New York Times police bureau chief, reveals every moment of Armanti's effort to break through the wall enforced by the cops' top brass. Here, with all its compromises, is the city of New York. Here, in all his humanity, is an unforgettable hero, battling for his honor and survival. Here is a remarkable story that ranks with the great police classics.