When college sweethearts Frankie and Ezra broke up before graduation, they vowed to never speak to each other again. Ten years later, they find themselves back together for the first time for the wedding of mutual friends. And then they wake up in bed next to each other the following morning with Ezra's grandmother's diamond on Frankie's finger, and zero memory of how they got there. Now Frankie and Ezra have to put aside old grievances in order to figure out what happened, what didn't happen...and to ask themselves the most troubling question of all: what if they both got it wrong the first time around?