1794: War and the revolution in France hang over Britain. In Cornwall, George Warleggan (Jack Farthing) continues to build his empire in a bid to crush the Poldarks and Elizabeth (Heida Reed) resolves to forge a new life for herself as his wife and a Warleggan, burying her past and Ross with it. However, she harbours a secret, one that threatens to undo the comfortable life she has finally secured for herself and son.

Ross and Demelza (Aidan Turner and Eleanor Tomlinson) attempt to keep the peace and avoid George for good, repairing their relationship at Nampara. However, the arrival of Demelza’s brothers disturbs the fragile truce and Ross must ask himself how long he can allow George’s ascent to continue unchecked… Meanwhile, Dwight (Luke Norris) is captured during the war with France and it falls on Ross to save his friend.

Facing battles both at home and abroad, will Ross answer the call and risk losing everything he holds dear?