An accident brings Charlotte Heywood to Sanditon, a seaside resort on the cusp of change. Spirited and unconventional, Charlotte is keen to experience everything the town has to offer, but is shocked by its scheming and ambitious inhabitants.

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 luncheon, and Esther and Edward realise that Clara poses a threat.

Charlotte is determined to avoid Sidney, until an accident forces them together. Tom brings a new doctor to town, and Clara makes a bold move.

The arrival of Miss Lambe's forbidden love causes Charlotte to question her opinion of Sidney. Clara witnesses a moment between Esther and Sir Edward that raises her suspicions about their relationship.

Tensions between Tom and his labourers erupt during a cricket match; Charlotte and Sidney continue to clash, resulting in Miss Lambe being placed in terrible danger.

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