Of Scars and Stardust by Andrea Hannah

Claire knows they're after her. For two years, they've been hunting her.

Two years ago, Claire Graham ran away from her hometown and a tragedy that still haunts her, even in New York City. But when she learns that her sister, Ella, has gone missing, Claire decides to return to Amble, Ohio, and face what happened there. And her involvement in it.

Determined to find Ella, Claire turns to Grant Buchanan, the soft-spoken boy from her past who, like Claire, has secrets he guards closely. The two of them navigate their growing attraction while following clues that Ella left behind. Through a series of cryptic diary entries, Claire tries to unlock the keys to Ella's past—and her own—in order to prevent another tragedy. But not all things lost are meant to be found.