The NYPD gears up to find the cop-killers who murdered two officers during an illegal firearms buy-and-bust sting, putting Detectives Fontana and Green on the trail of two suspects as Green risks his life to pose as a gun buyer, to gather evidence on the gun dealers. They soon discover the killers were tipped off to the victims' identities by a website displaying photos of undercover cops. Turns out the website is financed by a vengeful defense attorney (Isiah Whitlock, Jr.) whose criminal stepson was killed by the police; and now claims that he is protected by the First Amendment as McCoy and Southerlyn prepare to prosecute. McCoy is able to connect the hit men to the attorney who paid them to avenge the death of his gun-running stepson at the hands of the same detectives during a similar buy-and-bust several years earlier.