The book begins on an average day of school. Here we meet our narrators, Autumn, Claire, Tomas, and Sylv (left to right). There is an assembly inside, but other than that there is nothing remarkable about this day.
Meanwhile, Tyler is at home with a gun. He is about to shoot down a school. He wants to get revenge on all of the students that turned on him and ignored him.
Tyler enters the school with his gun and starts shooting. People start to hide, however, Tyler is only looking for two people to kill: Tomas and his sister, Autumn. Tomas is not in the auditorium, however, Autumn is. Meanwhile, Claire is outside for track practice.
Tyler goes hunting for Tomas, a guy that pushed him into the lockers and repeatedly frustrated him. He found Tomas in a room hiding with his sister Sylv. Tomas decides to distract the shooter so that his sister can escape. However, this ends up with him getting shot.
While the shooting is going on inside, Claire is waiting outside near the track and field. She hears gunshots and sees lots of worried parents outside. Autumn is injured as she was shot in the leg. While all of this is happening, police officers and SWAT Team officers are swarming the building.
The book ends with the shooter killing himself. Tomas ends up dead, Autumn ends up with an injured leg, which means she can never dance again, and Claire and Sylv end up without injury.