In Summer 1999, small-town computer genius Megan resents the arrival of outgoing and mysterious foreign exchange student Isabella. Little does she know how her life will change by Summer 2000.

In Summer 1999, Isabella grows closer to Luke while struggling to connect with Megan. In Winter 1999, Isabella searches for justice following the disastrous Christmas party.

In Summer 1999, Megan and Isabella bond during an overnight at the Chambers’ cabin. Luke tries to stand up to Brent, but ends up causing more problems for his dad. Suspicions are raised after fingerprints are found on the gun that shot Luke.

In Summer 1999, Megan wants to be adventurous and makes fake IDs for the gang. In Winter 1999, a burst pipe leads the Landrys and Isabella to a messy night at the Chambers house. Isabella wants to help but is met with resistance from Megan.

In Summer 1999, Isabella is rocked by a surprise visit from her past. In Winter 1999, Isabella’s concerns for Megan lead her to some surprising news. In Summer 2000, family loyalties are tested.

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.

Taking place over 3 summers in the 90s when a 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.

A new deposition threatens Jeanette’s case. A discovery causes Cindy’s suspicions about her own daughter to reach new heights as her relationship with Greg becomes further strained.

In winter 1999, tensions are high on Y2K. At the New Year's Eve party, a not-so-secret conversation changes the lives of the trio forever. In summer 2000, suspicion falls on Ned after some new evidence from summer 1999 comes to light.

In summer 1999, new friendships are formed and secrets are kept as the crew approaches senior year at the annual school car wash. In winter 1999, Megan and Isabella push for answers. In summer 2000, Debbie wants to protect her daughter.

Luke examines all his relationships and worries that the pressures of being a “Chambers man” have changed him.

Victim or villain? Jeanette continues to add fuel to the fire as her reckless behavior causes her friends and family to question her even more.

Kate, reeling from the lawsuit, prepares her defense and finds friendship in an unlikely source. The annual Wallis hunting trip becomes the setting for an important first meeting.

Jeannette and Kate cross paths at the Skylin High takeover of the County Fair, where one is desperate to prove herself and the other to lose herself.

Kate struggles with a family secret she’s been holding on to. Joy tries to convince Kate to go on “The Marsha Bailey Show.” Mallory has a birthday surprise.

On the first day of school, everyone learns that the drama of the summer is anything but over and that some people will pay more for the consequences of Jeanette and Kate's deception than others.

It’s time for the annual Skylin Garden Club Party! Year after year after year, the residents of Skylin struggle with the truth around what happened to Kate, keeping their secrets buried and maintaining appearances.

Kate and Jeanette's worlds collide as the court date arrives, finally forcing the two young women to answer the question on everyone's mind, but the answer comes with a price that not everyone can pay.

As timelines collide, friendships implode, new evidence emerges, and the shocking truth is revealed...in more ways than one.

Kate's closely held secrets and fragmented memories of her time in Martin's captivity are brought to the surface.