Needing money to open a mine free of George's influence, Ross strikes a deal with a local smuggler. Dwight, meanwhile, tries to diagnose an epidemic and receives help from an anonymous benefactor.
An informant in the smuggling ring poses a serious threat to all, and George buys Ross's debt to finally crush him. Meanwhile, Caroline returns to Cornwall to make an announcement, but it is Elizabeth who reveals a great secret.
Francis' final breakthrough at Wheal Grace reveals nothing of value, so Ross meets with Trencrom to locate Mark Daniel and see if he can locate the copper in the mine.
Trencrom strikes a deal to build a secret cache at Nampara where he can store contraband, putting much needed money in Ross' pocket but adding unwanted risk. Dwight is hailed as a hero for restoring Rosina to health, to Caroline's amusement.
George calls in Ross's debt, which means Ross will almost certainly go to debtors' prison. Meanwhile, as Ross spends more time looking after the widowed Elizabeth, Demelza fears she is losing him.
Dwight is ordered by Ray Penvenen to stop meeting Caroline but defies him and, though advised against it, Ross sells his remaining shares in Wheal Leisure in order to purchase Geoffrey Charles' shares in Wheal Grace anonymously - his last means of protecting Elizabeth and Geoffrey Charles.
Caroline convinces Dwight they must elope for a new life in Bat, as Ross sails with Trencrom to meet with Mark Daniel.
Caroline is forced to pull her plan forward but it is threatened when Rosina dislocates her knee again. Dwight believes he can treat her and still rendezvous with Caroline; however, he and Demelza become suspicious that Charlie Kempthorne is the informant when they learn he has avoided the smuggling run. Dwight confronts Charlie, and a fight ensues.
Demelza realises Ross will be walking into an ambush and attempts to warn the boat, but McNeil and his soldiers arrive at Nampara, leaving her under guard. Dwight incapacitates Charlie and escapes as Caroline sneaks out of Killewarren to meet him. Dwight attempts to warn Ross but is too late. Will Ross find a way to evade the soldiers?
Having paid men to harass Trenwith with the aim of driving Elizabeth to him for protection, George arrives at her home and posts his men to guard Elizabeth, who is both shocked and grateful for George's attention. Dwight is released by the soldiers, but finds Caroline has already returned to London...
Ross and Dwight stand trial for their part in the smuggling. A new tin lode gives Ross renewed hope in Wheal Grace, but it is George who is there for Elizabeth when her mother falls ill and deals Ross a bitter blow.
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