Amie Teller has been stuck on the same Sept. 17th for two years: Waking up every morning to the same coffee shop that’s always out of blueberry bagels; witnessing the same argument between her friend David Lenski and their notoriously unpleasant neighbor, Savannah Harlow; surviving the same awkward “friend date” with her ex-girlfriend Ziya Mathur, whom Amie maybe wishes weren’t an ex at all. Everything is exactly as expected, which is kind of how Amie likes things. So what should she do when time moves and she’s free and completely unprepared to live a day she hasn’t already rehearsed hundreds of times? Before she can figure out what life even looks like out of the eponymous loop, Amie learns that Savannah was murdered on September 17. Convinced that no one understands the day as comprehensively as she does, she accepts what she takes to be a kind of cosmic assignment: If she can solve Savannah’s murder, maybe she can make sense of having lost two years. With David’s help, and some assistance and romantic friction from Ziya, Amie sifts through Sept. 17 over and over to find those tiny moments she didn’t realize really mattered. By solving the mystery of Savannah’s death, Amie hopes to resolve her own questions about whether she and Ziya have potential, or if the time loop has drifted them too far apart.