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. There's just a random to-do list with 13 bizarre tasks that Emily would never try. But what if they can lead her to Sloane? Getting through Sloane's list will mean a lot of firsts, and with a whole summer ahead of her, and with the unexpected help of the handsome Frank Porter, who knows what she'll find?