Nan's wedding day is in full swing, but a surprise appearance by someone from her past threatens to derail the festivities.

Amid the Tintagel spring gala, Lizzy grapples with whether to share crucial information with Nan.

A betrayal, a reunion, and an unexpected spark—Lizzy's enchanted birthday party will be one to remember.

From sun-drenched Italy to a champagne-soaked English garden party, emotions run high and chances are taken.

The buccaneers prepare for Lizzy's wedding day. Nan returns to face the music as things get more complicated.

Tensions are set aside—for now—to help Jinny fight for her freedom.

Things unravel during a weekend at Guy's family home, as Nan finds herself feeling torn. Mabel and Honoria get closer.

The gang head to Scotland for a Christmas getaway. Lizzy makes a confession. James' behavior escalates. Nan faces a hard choice.

The Brightlingseas host a New Year's Eve party where the bombshell news is the hot topic. Tensions flare as Theo and Guy's rivalry explodes.

Nan must figure out her path forward. Jinny feels trapped. Mrs. St. George reckons with the state of her family.

At the exclusive Tintagel ball, Nan considers the prospect of becoming a duchess. Conchita struggles with her mother-in-law's approval.

The girls return to New York for a grand celebration. Nan seeks answers from her family. James begins to manipulate Jinny.

Conchita hosts a raucous country house party. Jinny and Lizzy go head-to-head for the same man. Nan reveals a secret.

A group of young American heiresses are changed forever when they're whisked across the Atlantic to London.

In New York, the scandalous St. George divorce trial is underway. Nan copes with further revelations about her birth mother.

The end-of-season Tintagel Ball sets off an explosive chain of revelations and betrayals—and Nan's life will never be the same.