10:00 am: The principal of Opportunity High School in Alabama finishes her speech, welcoming the entire student body to a new semester and encouraging them to excel and achieve.

10:02 am: The students get up to leave the auditorium for their next class.

10:03 am: The auditorium doors won’t open.

10:05 am: Someone starts shooting.

This explosive, emotional, page-turning debut about a high school held hostage is told from the perspective of four teens—each with their own reason to fear the boy with the gun.