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 governess for the mysterious Alexander Colbourne. Alison longs for her knight in shining armor. Georgiana receives bad news, and Tom and Colonel Lennox make plans for Sanditon's development.

Charlotte and Alexander Colbourne reach an understanding as she and Colonel Lennox enjoy a close encounter. Alison falls for her new beau. Clara seeks Esther's help.

Tension mounts when Colbourne and Colonel Lennox reunite at Lady Denham's garden party. Georgiana learns a vital piece of information about her inheritance. Alison's proposal nearly ends in tragedy.

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 as Alison realizes what she has been missing.

Alison gets ready to leave Sanditon with her dreams in tatters. Charlotte considers what her future will look like, while Georgiana learns some shocking truths, and Esther faces a bleak future. With so much at stake, will anyone have a happily ever after?