Before Sloane, Emily didn't go to parties, she barely talked to guys, and she didn't do anything crazy. Enter Sloane, social tornado and the best kind of best friend - someone who yanks you out of your shell. But right before what should have been an epic summer, Sloane just disappears. No note. No calls. No texts. No Sloane. There's just a random to-do list with thirteen bizarre tasks that Emily would never try. But what if they can lead her to Sloane? Apple picking at night? Okay, easy enough. Dance until dawn? Sure. Why not? Kiss a stranger? Wait - what? Getting through Sloane's list will...