Seven Times Unto Eternity — J.S. Frankel

Being reincarnated over and over is one thing. Becoming the opposite sex is another. But saving the world is an entirely different story-and it's also a lot stranger.You get only one go-around in life, or so the experts say. Paige DeMaster, almost nineteen years of age, formerly Callisto Merriwether, formerly five other lives, has seven chances to right a major wrong. She has seven chances to save the world as well as save herself-and now she's down to her last chance.