After San Francisco suffers a week of terror at the hands of a serial killer ending with the death of Laura Price’s eight-year-old daughter Serena, Laura falls into a dark depression and attempts suicide. Next thing she knows, she’s waking up before that week, whereupon she teams up with ex-police detective Nico Jackson (who also got thrown back in time), hoping to change the week, catch the killer, save Nico’s brother’s life, and save Serena—all in a mere nine additional episodes.