A chance accident brings Charlotte Heywood to Sanditon, a seaside resort on the cusp of dramatic change.

Charlotte and Sidney clash again, only for Charlotte to be left confused by a chance encounter. Tensions surrounding Miss Lambe's arrival in Sanditon erupt at Lady Denham's grand pineapple luncheon.

Charlotte sets out to avoid Sidney, until a serious accident forces them together and to reappraise each other. When Tom brings a new doctor to the town, he and Lady Denham clash.

The arrival of Miss Lambe's forbidden love causes Charlotte to question her opinion of Sidney. Meanwhile, Clara witnesses a moment between Esther and Edward.

Charlotte inadvertently places Miss Lambe in danger, whilst tensions between Tom and his labourers erupt during the Sanditon cricket match.

Charlotte and Sidney are at loggerheads but must work together to save Miss Lambe from terrible danger. Edward and Clara enter into a scandalous pact to try and finally win Lady Denham's inheritance.