In summer 1999, sparks fly at Luke's birthday party. In winter 1999, relationships are tested as Megan becomes more distant from Luke. In summer 2000, Megan obsesses over an interesting letter she received.
The unconventional drama takes place over three summers in the 90s when a beautiful and popular teen goes missing, and a seemingly unrelated girl transforms from a sweet and awkward outlier to the most popular girl in town, eventually becoming the most despised person in America. Each episode is told from alternating POVs.