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 surround Miss Lambe's arrival in Sanditon.

Charlotte sets out to avoid Sidney, until a serious accident forces them together. Clara makes a bold move in her bid to outplay Sir Edward and Esther.

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

Tensions between Tom and his labourers erupt during the Sanditon cricket match. Charlotte and Sidney continue to clash, resulting in Miss Lambe being placed in terrible danger. Lord Babington offers Esther a glimpse of a better future.

Charlotte and Sidney are at loggerheads but must work together to try and rescue Miss Lambe. Tom tries to save Sanditon and his marriage, whilst Edward and Clara enter into a scandalous pact to try and finally win Lady Denham's inheritance.

As the Sanditon summer regatta approaches, Sidney wrestles with his feelings towards an old flame and Young Stringer reveals his feelings to Charlotte.

On the night of the Midsummer Ball, romantic interests are finally resolved. However, the fate of Sanditon is in the balance when events conspire to leave Charlotte and the Parker family facing down impossible choices.