Fade To Blue
The novel begins with alternating chapters from two characters: Sophie, an angry Goth teenager and sarcastic social outcast; and Kenny, the 'big man on campus' whose life may be a little TOO perfect. Gradually the reader begins to see some parallels between the two teenager's lives, building up to the big reveal. Kenny, in fact, is Sophie reincarnated and living out a fantasy life! But is she really dead? Sophie gradually unravels the mystery of what is happening to her, what is happening to the real Kenny, and what happened when her father mysteriously disappeared a year earlier.
There is a science fiction/fantasy element, discussion of medical research, philosophy, commerce and ethics throughout. Ultimately, this is a wildly innovative young adult novel filled with appealing, sharply-drawn characters, and crazy twists and turns.