Day 5 of the Book Blogger's Challenge
I cry about a lot of books, so it's hard to distinguish between an actual tear jerker or something that will only make me cry.
I'm going to go with Come Back by Claire and Mia Fontaine.
Mia ran away from home at 15 and this book is written like the combination of her journal and her mother's journal as she hit rock bottom and then went through rehab. I've read it several times and cry through large portions of it every time.