Since You’ve Been Gone by Morgan Matson

sinceEmily Hughes’s best friend Sloane has disappeared without a trace-Emily has called, texted, and driven by her house, but it’s as though Sloane and her family have ceased to exist. Then, one of Sloane’s famous “to do” lists mysteriously shows up, with 13 directives for Emily, including “Kiss a stranger,” “Go skinny- dipping,” and “Dance until dawn.” In Sloane’s absence, the list-full of things she knew Emily would find fun, but a challenge, too-defines Emily’s summer, helping her meet new friends (including cute Frank Porter), come out of her shell, and find a way to hang on to Sloane.