St. Valentine's Massacre

S1 E9: When five merchants are gunned down in a restaurant in Lincoln Park, key evidence points to an incarcerated gang leader from the impoverished neighborhood. Relentless press coverage prompts the embattled mayor to blame the city’s rising crime problem on Superintendent Colvin, who, in turn, unleashes Jarek and Caleb to catch the killers in hopes of restoring her credibility as a competent leader. Meanwhile, Isaac and Vonda are forced to revisit a past domestic violence case.