Period drama. Lord Falmouth urges Ross to return to Westminster as George's alliance with Adderley gives him the opportunity to purchase a borough of his own. Dwight tells Caroline some devastating news about Sarah. Ossie is seen visiting Rowella by her husband Arthur, who grows suspicious. When Wheal Grace's miners blast into Wheal Maiden's tunnels it results in a disastrous flood, forcing Ross, Sam and Dwight into acts of heroism. Emma returns to give Sam her answer, whilst Drake is persuaded into courting Rosina. Ross remains in Cornwall and decides to plough his savings into resurrecting the mine rather than allow it to close and impoverish his employees. He then bids farewell to his family, confident in Demelza's ability to govern in his absence. However, unbeknownst to Ross, George has secured the borough of St Michael, and with it his own return to Westminster. With Aidan Turner, Eleanor Tomlinson, Christian Brassington, Ellise Chappell, and Beatie Edney.