Senior year was supposed to be great--that's what Ember's friend Maddie promised at the beginning of the year. Instead, Ember TrouvE spends the year drifting in and out of life like a ghost, haunted by her parents' recent, tragic death.

At home, she pores over her secret obsession: pictures of missing kids-- from newspaper articles, from grocery store flyers-- that she's glued inside a spiral notebook. Like her, the people are lost. Like her, she discovers, they had been looking for a way to numb their pain when they disappeared.

When Ember finds herself in Trinity Forest one...