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 remember everything he’s saying. Because time is about to loop. In a flash of energy, it’s Monday morning. Again. Together, Mariana and Carter enter an inevitable life, four days at a time, over and over, without permanence except for what they share. With everything resetting—even bank accounts—joy comes in the little moments: a delicious (and expensive) meal, the purr of a tiny cat, a tennis match, giving a dog his favorite treat.