When the Gun Goes Bang, Bang, Bang (S01E10)

Following the assassination of an undercover officer involved in a drug trafficking operation, the murderers shift their focus to Boston's homicide division. This perilous turn of events ensnares Jane, Maura, and Frankie Jr. in a desperate battle for survival right in their own precinct. The crisis pushes Maura to confront her limits like never before. Meanwhile, at home, Jane's parents are thrilled about the impending release of their eldest son, Tommy, after his time behind bars.