Parallel by Lauren Miller

"Abby Barnes had a plan. The Plan. She'd go to Northwestern, major in journalism, and land a job at a national newspaper, all before she turned twenty-two. But one tiny choice—taking a drama class her senior year of high school—changed all that. Now, on the eve of her eighteenth birthday, Abby is stuck on a Hollywood movie set, miles from where she wants to be, wishing she could rewind her life. The next morning, she's in a dorm room at Yale, with no memory of how she got there. Overnight, it's as if her past has been rewritten.

With the help of Caitlin, her science-savvy BFF, Abby discovers that this new reality is the result of a cosmic collision of parallel universes that has Abby living an alternate version of her life. And not only that: Abby's life changes every time her parallel self makes a new choice. Meanwhile, her parallel is living out Abby's senior year of high school and falling for someone Abby's never even met.

As she struggles to navigate her ever-shifting existence, forced to live out the consequences of a path she didn't choose, Abby must let go of the Plan and learn to focus on the present, without losing sight of who she is, the boy who might just be her soul mate, and the destiny that's finally within reach."

I think I could give this one a pretty favorable review. I wasn't completely sure about it at some bits, but overall I can give props to the author for using a different type of concept. That was what actually hooked me in--the diverging options. The concept seemed a little half-baked to me in execution at first, but as I started to think more about what was happening and wrap my head around it, it got more complex. Overall, I think the premise was done well, and would benefit from a second reading. 
As for the characters and the plot, it was a bit of a mix but generally good feedback. It was kind of interesting to explore the diverging possibilities, but the challenges the characters face are purely high school drama-type stuff--friend fights, mean girls, complicated love triangles, etc. That may have cheapened it a teeny bit for me, going for the well-used situations, but I think the way the author wrote it could have been a lot worse; she managed to get me to mostly enjoy what was going on, with only slight wincing  at the teen drama. Overall I think it was an enjoyable book and maybe worth a re-read someday. Four stars. There's a copy at Kettleson (or at least there will be once I turn it in).