In the climactic season finale, Nick receives devastating news, and struggles to contain his explosive response. A surprise visitor lands in Ben's life, forcing him to make some very hard decisions.

The entire squad is embroiled in an intensely tragic school shooting with consequences that will profoundly impact all of their lives.

In the aftermath of the school shooting, the squad copes with the trauma as it affects them in ways they never expected.

Amelie takes a chance on Ben, while Nick and Isabelle receive shocking news about Theo.

The hunt for the mole takes a dramatic shift when Nick is pulled off patrol.

An accidental death leads violent protesters to occupy an abandoned building.

The identity of the mole is revealed.