Once, Kerry and Eve Barnard did everything together: sailing the Block Island harbor with their father, listening to their neighbor Justin’s magical fairy tales, and all the while longing for their absent mother. They were twin girls arm in arm, secrets entwined between two hearts. Until the summer of their seventeenth birthday, when their extraordinary bond was shattered. And thirteen years later, it will take all the courage they can summon to put the pieces back together—at a time when it matters most.