In the season two premiere, the entire squad is involved in an intensely tragic school shooting which profoundly impacts their lives.

The aftermath of a school shooting finds the squad trying to deal with the tragedy. Meanwhile, a traumatized Audrey returns to duty, and Nick offers support to ben, who gets suspended and must undergo therapy.

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

An arrest hits close to home for Nick when Kaz�۪s wife is charged with assault, and Ben begins to believe his concerns are justified. Tyler comes back to 19, and Vince�۪s conduct is called into question.

When a young girl tries to commit suicide, Nick and Isabelle are startled to find out that Theo may be connected to the case. After her confrontation with Ben, Amelie must make a decision about their relationship.

The search for the mole takes an unexpected turn when Nick is pulled off duty. Audrey and J.M. are partnered, and Beatrice gets reacquainted with an old flame.

Station 19 assists with serving final eviction notices for a condemned building, while Ben and Nick team up to find the truth about the mole.

After an accidental death, the community erupts into violent protests. Ben and Nick suspect that one of the station leaders might be the mole, and Tyler panics during a raid of the condemned building.

Ben and Nick try to get more information from Sandrine about her father, but the homicide department calls them in for questioning in Anthony Tremblay�۪s murder.

The mole goes on the run after his identity is uncovered. The whole department is on the lookout for him, but Ben and Nick are determined to find him first.