(Book 1 of 4)NO ONE IS GOING TO BELIEVE ME.But I know I did it. I was there. If she's real—and I know she is—I just have to prove it. Go there again and this time bring something back. Like a strand of her hair or a piece of her fingernail.SOMETHING WITH HER DNA ON IT. TO PROVE THAT SHE IS ME.High school senior and amateur physicist Audie Masters has discovered what no other physicist has been able to prove: that parallel universes do exist, and there is a way to journey into them. She also discovers something else: a parallel version of herself, living the kind of life Audie never could have imagined for herself.Now Audie is living that life, too, full of adventure, romance, and reality-bending science. It's all more than she could have hoped for—until something goes wrong.