A terrible accident brings sixteen-year-old Casey Everett's life to a halt-literally. Pulled from the water, Casey is rushed to the hospital and miraculously revived. But her sudden return to the living is shadowed by the drowning of her best friend, Liddy. Overcome with grief, Casey returns home for the summer only to find the memories of the accident won't let her go. Shadow-drenched nightmares. Whispers in the back of her mind. Her friend's screams. Casey thinks she's losing it... until she watches a boy fall from the sky. Red-an angel fallen to earth to regain his wings-takes her to Limbo, a place that exists somewhere between the living and the dead. Now, in order to save her best friend, Casey must learn to walk these mysterious and dangerous paths or else risk losing Liddy's trapped soul to something worse than death.