Clark and Owen investigate the murder of a gang member at a housing development, where a teen was also injured; and Arroyo threatens to go public with evidence that Clark gave a criminal informant confiscated money.

Owen takes a special interest in a murder investigation when the victim, an airport supervisor, also turns out to be the brother of a confidential informant who was killed a few years ago. Meanwhile, Clark's newly sober mother shows up wanting to reconnect with her children, but Clark is hesitant to let her.