Close your eyes / Nicci Cloke.

"Southfield High School is oh so normal, with its good teachers, its bad, and its cliques. But despite the cliques, there’s a particular group of friends who have known each other forever and know that they can rely on each other for anything. There’s the twins: Aisha, rebellious, kind, and just a tiny bit worried about what the hell she’s going to do once this year is over, and Ash, smart, quiet and observant. Then there’s Remy, the loudmouth, and Gemma, who’s more interested in college boys and getting into the crap club in town. And then there’s Elise: the pretty one. But at the start of Year 11, when the group befriend the new boy, Elijah, things start to change. The group find themselves not as close as they used to be. Until one Tuesday, when the students are trapped inside the school building. And one of them has a gun. Close Your Eyes is the story of a school shooting which, through interviews, messages and questionable actions, asks: Who is truly responsible?"--author's website.