Chicago Fire Season 4 Episode 19

Casey becomes involved when a high-school student is the victim of a gang-retribution incident; Severide lends a hand to Det. Holloway, who's involved in an undercover operation, and watches her 9-year-old son at the firehouse; Brett and Jimmy are called to aid a woman who takes a liking to Jimmy; Otis makes a surprising discovery; and Herrmann's bar-running prowess is challenged.