Detective Louis N. Scarcella was a legendary figure in New York City during the '90s. In a city overrun with violent crime, he cracked the toughest cases and put away the worst criminals. But the story changed when a group of convicted murderers-turned-jailhouse lawyers made a startling discovery that linked all their cases: Scarcella was the cop who helped put many of them away. They made a vow: Take down Scarcella. And with the help of a relentless New York Times reporter, they did just that. Thirty years later, 20 people who Scarcella helped put behind bars have since walked free. In...