In New York City, follows the breakup of teenaged best friends Cleo and Layla, told in alternating timelines. It's been twenty-seven days since Cleo and Layla's friendship imploded. Cleo realizes they'll never be besties again, and she wants to erase every memory, good or bad, that tethers her to her ex-best friend. But when Cleo is assigned to be Layla's tutor, their turbulent past comes back to haunt them both.