As George Warleggan continues to build his empire in a bid to crush the Poldarks, Elizabeth harbors a secret that threatens to undo the comfortable life she has secured for herself and son. Ross and Demelza attempt to repair their relationship and keep the peace but the arrival of Demelza's brothers disturbs the fragile truce. Meanwhile, Dwight 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?
