I'm Not Missing, by Carrie Fountain
It's senior year, and Miranda Black's best friend, Syd, has run away - suddenly and inexplicably, leaving behind nothing but a pink leopard print cell phone with a text message from the mysterious HIM.
Everyone wants to know why Syd left, but the truth is, Miranda has no idea. When Miranda's mother abandoned her as a child, Miranda had found shelter in her friendship with Syd, who wore her own motherlessness like a badge of honor.
Now Miranda's been left behind again, left to untangle the questions of why Syd left, where she is - and if she's even a friend worth saving, all while stumbling into her first love with the most unlikely boy in school. How do you take on the future when it feels like so much of your past wasn't even real?