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.

After the arrest of a misunderstood homeless man and the retrieval of a runaway, Nick and Ben realize that not everyone can be saved.

The squad becomes involved in a feud with firemen; little mistakes cause consequences.

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.

After an accidental death, violent protesters occupy an abandoned building and the squad must clear them out.

The identity of the mole is revealed.

With the mole on the run, a devastated squad turn on each other, and on themselves.