The only thing harder than finding someone in a time loop is losing them.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...