Chris makes a friend

"Chris does not want to be spending the summer with her grandparents and her little sister. Her grandparents aren't bad--they just don't let Chris do what she wants to do, which is sit around and read all day. And her sister, Becca, is the opposite, never sitting still and never being quiet. The good part is that Chris's grandparents are always telling her to go outside and 'get some air'--so she can escape into the woods with a book and get some alone time. Or at least it's alone time until Mia comes along. Mia is also in town for the summer, and she understands Chris in a way that Chris's family just can't. Soon Chris is sneaking off to spend as much time with her friend as possible. But is there more to Mia than Mia is saying?"--Goodreads.