To avoid being arrested, a petty thief leads Clark to a murdered, drug addicted young woman with a missing daughter. Meanwhile, Clark and Arroyo continue to butt heads.

Owen takes the lead on a murder investigation involving the brother of his former criminal informant who was killed a few years before. Meanwhile, Clark struggles with whether or not to let his recently sober mother back into his and Agnes' life.

McKenzie seeks justice for her family when bullets found at the scene of a subway shooting match the same gun that killed her brother several years earlier. Meanwhile, Owen has reservations about retiring in two years.