Tsundoku reviewed Monday's Not Coming by Tiffany D. Jackson
This book is EXTREMELY depressing and will fuck you up
4 stars
Content warning Child Abuse; Child death; sexual abuse
Your premise is that the protagonist's best friend doesn't show up to school after the summer break they spent apart.
You spend the rest of the story finding out exactly what happened and how so many, so MANY people fucked up.
It's obviously a downer of a book. But it's good, I recommend it.