"Grieving her best friend's recent death, neuroscientist Mariana Pineda's ready to give up everything to start anew. Even her career--after one last week consulting at a top secret particle accelerator. Except the strangest thing happens: a man stops her...and claims they've met before. Carter Cho knows who she is, why she's mourning, why she's there. And he needs Mariana to remember everything he's saying. But just as they figure out this new life, everything changes. Because Carter's memories of the time loop are slowly disappearing. And their only chance at happiness is breaking out of the loop--forever"-- Publisher's description.