I read this book in '05 on a vacation and can not remember the tilte/author. I believe it took place in St.Louis. A true story It was written by the youngest cousin/sister of the characters who where attacked and thrown into the river by some guys. A family gathering brought these cousins together. The family members walked under the bridge together.I remember something about a poem written in grafiti was the reason the were there after dark.They were attacked, there was a male & a couple girls. The author was one of the survivors.

A Rip in Heaven: A Memoir of Murder And Its Aftermath by Jeanine Cummins.