Young Stringer presses Tom for back pay owed his builders, currently toiling under dangerous conditions. Aided by the new doctor, Charlotte and Sidney respond to an emergency. Miss Lambe pines for her absent lover.
A coach accident brings Charlotte to Sanditon, where she meets Tom and Sidney Parker. Lady Denham hosts a pineapple party for West Indian heiress Miss Lambe. Edward's relatives complicate matters. Charlotte and Sidney have an awkward encounter.
At loggerheads over the disappearance of Miss Lambe, Charlotte and Sidney comb the London underworld to find her. Meanwhile, Tom tries to save Sanditon and his marriage, and Edward and Clara hatch a cunning plot to seize Lady Denham's legacy.