A quiet shift goes awry when the entire squad responds to one of their worst call of their careers and are involved in an intensely tragic school shooting which profoundly impacts their lives.
In the aftermath of the school shooting, the squad copes with the trauma as it affects them in ways they never expected. Meanwhile, a traumatized Audrey returns to duty, with her beauty restored.
After the arrest of a misunderstood homeless man and the retrieval of a runaway, Nick and Ben realize that not everyone can be saved. Meanwhile, SQ feel they've found a key link between Nick and organized crime.