Matt Bashir, history teacher and former deputy principal at a prestigious girls' school, is swiftly promoted to principal of Boxdale Boys High. Just when it seems he is making progress, 17-year-old student Karim is found dead on school grounds.

The school is in lockdown as the police begin investigating Karim's death, and Bashir battles to contain the rage of the victim's brother Tarek. Amongst such a volatile gang culture, can Principal Bashir stop Tarek from avenging his brother's death?

At Karim's funeral, Bashir finds himself in the middle of an unfamiliar Muslim ceremony, surrounded by a rag-tag group of students from diverse ethnic backgrounds. Waiting outside with the women during the service, officer Kellie notices something suspicious in the background.

Detective Bilic (Aden Young, "Rectified") and officer Kellie narrow down the suspects, but Tarek is certain he knows who the killer is and wants revenge.