Who Is Mackie Spence?

Jeremy's friend, Mackie Spence, seems different. She doesn't act like the same person he's grown up with all his life. And Jeremy would know. In the last year, he's paid close attention, as that funny little girl suddenly turned into a knockout. But now something is beyond weird. He didn't see much of Mackie during the summer that followed her near-drowning incident. But it's September, she's back at school, and Jeremy can't explain the changes in her. After all, he's a jock who understands...