Did you ever wonder how your life would turn out if you had made just the tiniest decision change? Gone home instead of gone to that last bar? Well that is the premise of this work. Hannah goes home in one version of the story and in the other stays out at the bars. Each chapter flips between 'versions'. Gets a bit confusing. But it's a quick read, I cared about the characters and in both versions certain things are just meant to be.