Now That You're Here — Amy K. Nichols

In a parallel universe, the classic bad boy falls for the class science geek.

One minute Danny was running from the cops, and the next, he jolted awake in an unfamiliar body--his own, but different. Somehow, he's crossed into a parallel universe. Now his friends are his enemies, his parents are long dead, and studious Eevee is not the mysterious femme fatale he once kissed back home. Then again, this Eevee--a girl who'd rather land an internship at NASA than a date to the prom--may be his only hope of getting home.

Eevee tells herself she's only helping him in the name of quantum physics, but there's something undeniably fascinating about this boy from another dimension ... a boy who makes her question who she is, and who she might be in another place and time.

And, coming soon, Duplexity, Part II: While You Were Gone flips this story on its head and tells the tale of the alternate Danny and the alternate Eevee, living in Danny's parallel world.