The hit-and-run death of a popular high-school student leaves the detectives suspecting the girl's father was the real target. When evidence reveals that the death was possibly a random killing, they are able to track down their suspect to his apartment. However things get complicated when their killer is murdered, and the person who committed the crime happens to be the victim's mother.

After Green goes undercover to gather evidence on the gun dealers who murdered two detectives during a buy-and-bust, 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.