Brenda and the Priority Homicide Team investigate a sniper who is killing gang members in and around MacArthur Park. Offering assistance is an ex-Army colonel who believes the sniper to be his son. As an all-out gang war looms, Brenda tentatively accepts his assistance, but as her investigation progresses, Brenda's doubts about the Colonel's motives grow. With Fritz' assistance, she realizes the Colonel is not there to help, but to help his son escape. The two face off in the dark on a Los Angeles rooftop, leading to an unexpected outcome. Elsewhere in the story, Sanchez' prior service with the Rampart Division CRASH gang squad allows him to play a pivotal role in the investigation as he briefs the squad on gang activity in the area, goes undercover as a gang member and assists with interrogations. Brenda's tense relationship with Taylor seems to relax, then abruptly grows tenser when a stake-out goes wrong. Gabriel becomes increasingly loyal to her, but Flynn and Provenza continue to resist her methods, dubbing her "Miss Scarlett."