Nina and McNamara work together on a case where two robbers are murdered. Nina freezes in battle and decides to turn in her gun. G hangs out with young thieves.
A female bounty hunter uses Williams to help find a fugitive in protective custody. Nina and McNamara suspect the wife of a recently deceased cop. Natasha visits the precinct.
McNamara goes undercover involving a Chinese Mafia that has a link with his father's death. Torres asks his sister for money to buy an engagement ring for Nina.
Williams goes undercover at a prison to find evidence that will catch a drug lord. William's new friend in prison becomes involved in a murder. Torres proposes to Nina.