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10:00 a.m.The principal of Opportunity, Alabama's high school finishes her speech, welcoming the entire student body to a new semester and encouraging them to excel and achieve.
10:02 a.m.The students get up to leave the auditorium for their next class.
10:03The auditorium doors won't open.
10:05Someone starts shooting.
Told over the span of 54 harrowing minutes from four different perspectives, terror reigns as one student's calculated revenge turns into the ultimate game of survival.