With the approach of Sanditon's regatta, the success of the resort hangs in the balance -- as do assorted romances. How will Charlotte, Sidney and other lovers fare in the marriage game?

On the night of the Midsummer Ball, romance, jealousy and betrayal fill the air. Events conspire to leave Charlotte and the Parker family facing difficult choices.

Charlotte returns to Sanditon in unexpected circumstances. A company of Army Officers descend on the town, offering romantic opportunities. Meanwhile, Georgiana meets an intriguing artist and Esther Babington has an unwanted encounter with her past.

Charlotte starts her new job as a Governess for the mysterious Alexander Colbourne. Alison seeks to be reunited with her knight in shining armour, and Georgiana receives bad news. Meanwhile, Tom and Colonel Lennox make plans for Sanditon's development.

Charlotte and Alexander Colbourne reach an understanding as she & Col. Lennox enjoy a close encounter at the Midsummer Fair. Alison is falling for her new beau Captain Carter, unaware he's wooing her under false pretenses. Clara calls on Esther for help.

Tension mounts for Charlotte when Colbourne and Colonel Lennox reunite at Lady Denham's annual Garden Party. Georgiana learns a vital piece of information about her inheritance, and Alison's much desired proposal nearly ends in tragedy.

Lennox and Colbourne's rivalry over Charlotte comes to a head and Georgiana makes a decision that will impact her future, forever. Edward's manipulation of Esther takes a dark turn and Alison realizes what she has been missing.

Alison prepares to leave Sanditon with her dreams of romance in tatters, and Esther faces a bleak future. Charlotte considers what her future will look like. When Sidney's belongings are returned to Sanditon, Georgiana learns some shocking truths.