New series. The period drama returns for a fourth series, which sees the country plunged into uncertainty when the prime minister calls an election. George Warleggan's reign as member for Truro has had a devastating impact on the city, and Hugh is determined to displace him. Rioting erupts on the streets, which results in Zacky's son and the Carnes brothers being accused of murder, while Ross is helpless to intervene. The Enyses consider having a child, and Demelza seeks to reconcile two rival local lords.