[Season Finale] Hermione Norris stars when Poirot's holiday on the South Coast is interrupted. An actress' priceless gems go missing and her husband begs him to find them.

Morgana leads a terrifying manhunt in pursuit her old foe Alator of the Catha (Gary Lewis) for she knows without doubt that he can tell her exactly where to find Emrys. Merlin's life has never been in more danger, so when the mysterious Finna (Sorcha Cusack) offers to help him, is he right to trust her?

Dr. Ellis confronts local prejudice when he discovers one of his patients has contracted a rare disease abroad. Meanwhile, Jack and Alun hatch a crackpot scheme to raise chickens, and Brigid makes a big decision about baby Aisling's future.

Ken lands himself in trouble when he tries to help a group of tenants being evicted.