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 22. But one tiny choice - deciding to take a drama class her senior year of high school - changed all that.
Now, a year later, on the eve of her 18th birthday, Abby is stuck on a Hollywood movie set, 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 - an Ivy League address, a spot on the crew team, a birthday blind date with a cute lacrosse player - 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. 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 soulmate, and the destiny that's finally in reach.