Charlotte returns to Sanditon in unexpected circumstances. A group of Army officers descend on the town, offering both romantic and business opportunities. Georgiana meets an intriguing artist. Esther Babington has an unwanted encounter.

Charlotte starts her new job for the mysterious Alexander Colbourne. Alison is determined to be reunited with her beau, and Georgiana receives some bad news. Lady Denham receives an unexpected surprise. Tom and Colonel Lennox make plans.

Charlotte and Alexander Colbourne reach an understanding as she and Colonel Lennox enjoy a close encounter. Alison falls for her new beau, unaware he's wooing her under false pretenses. Clara seeks Esther's help. Edward hatches a plan.

Tension mounts when Colbourne and Colonel Lennox reunite at Lady Denham's garden party. Georgiana learns a vital piece of information. Alison's much desired proposal nearly ends in tragedy. Edward attempts to exploit Clara's predicament.

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

Alison prepares to leave Sanditon with her dreams of romance fading. Charlotte ponders her future. Georgiana learns shocking truths when Sidney's belongings are returned. Esther faces a bleak future as Edward's schemes come to fruition.