Hourglass by Myra McEntire

This was one of those books that I just couldn't put down. It was good straight through. It's about a girl who's parents died a few months ago in a skiing accident. She lives with her brother and his wife, and she's really happy. Except for the visions. Where you or I would find empty space, she sees ghosts from the past, walking around just like anyone else. Most of the time, she can tell them apart. But sometimes, she ends up talking to thin air. She has one loyal friend who has a few secrets of her own, and her brother is fiercely loyal. So when he calls a consultant to try to help her, she agrees. The person she meets changes her life. This is a story about theoretical physics, superheroes, and love that transcends time. I definitely couldn't put it down.