Books like Since You've Been Gone

It was Sloane who yanked Emily out of her shell and made life 100% interesting. But right before what should have been the most epic summer, Sloane just…disappears. All she leaves behind is a to-do list.On it, thirteen Sloane-inspired tasks that Emily would normally never try. But what if they could bring her best friend back?Apple picking at night? Okay, easy enough.Dance until dawn? Sure. Why not?Kiss a stranger? Um... Emily now has this unexpected summer, and the help of Frank Porter (totally unexpected), to check things off Sloane's list. Who knows what she’ll find?Go skinny-dipping? Wait...what?