You're Dead to Me by Amy Christine Parker
Most girls look forward to prom, but not Ruby. Since seeing the gruesome ghost of her dead self, she's a little busy investigating her own possible murder and the corrupt underbelly of her idyllic town. It takes a lot to surprise me, but this one at least 25% shocked me. Part of that was due to some underdeveloped characters, but mostly it was really good plotting. Parker's novel may be filled with teens, but they certainly know the meaning of "ride-or-die". For a YA read, there was surprising depth: from the friendships and familial bonds, to the themes of retaliation, greed, and embracing life. This was the perfect blend of suspense, a pinch of horror, rich figurative language, and just a touch of romance. Un-put-downable.