Eleanor and Park by Rainbow Rowells. Several of you recommended this. “This was a YA hit last year, but I only got around to reading it this year and loved it. Two high school misfits secretly love each other. They trade mixtapes and comic books and secretly spend time together. He is from a loving family. She's from a broken, abusive home. It's sweet and lovely, and I adore the author and think she's a class act.”
