That's Not What Happened

"It's been three years since the Virgil County High School Massacre. Three years since my best friend, Sarah, was killed in a bathroom stall during the mass shooting. Everyone knows Sarah's story — that she died proclaiming her faith.←
But it's not true.

I know because I was with her when she died. I didn't say anything then, and people got hurt because of it. Now Sarah's parents are publishing a book about her, so this might be my last chance to set the record straight… but I'm not the only survivor with a story to tell about what did — and didn't — happen that day.←
Except Sarah's martyrdom is important to a lot of people, people who don't take kindly to what I'm trying to do. And the more I learn, the less certain I am about what's right. I don't know what will be worse: the guilt of staying silent or the consequences of speaking up…"

Summary from publishers Scholastic, Inc.: https://www.scholastic.com/teachers/books/that-s-not-what-happened-by-kody-keplinger/