Altered State — Julie Parker

Life as a ghost is an adjustment for Casa—one of six teens chosen for an experimental project. Her body rests deep inside the mountains surrounding her small town, awaiting the day a cure is discovered for her condition.Suspicions surrounding the project arise, forcing Casa to uncover hard, uncomfortable truths behind the science. She soon discovers that bodies aren't the only thing buried in the mountains, and the cost of cures might be the existence of the human race.