From grade school to junior year, Ian Wilder's heart belongs to one person-his next-door neighbor and best friend Penelope Archer. To him, they match like the last two puzzle pieces across an infinite, jigsaw universe. Together, they spend every free moment in the outgrown treehouse adjoining their yards. There, under the dull glow of dying flashlights, Ian scribbles the words and Penelope paints the worlds from their imagination. From western...