A plea for help from an old friend disturbs the Poldarks’ newfound peace, while George struggles after Elizabeth’s death.

Demelza and the children join Ross in London, but his pursuit to help Ned finds them caught in a dangerous web. George’s grief has unexpected consequences.

Ross’ mission to help Ned bears fruit, but not without cost. A new relationship continues to blossom, while George’s sanity continues to deteriorate.

Ross receives hopeful news and Dwight gains unexpected patients. Geoffrey Charles and Cecily discover the devastating truth of Ralph and Cary’s plan.

Ross hopes to secure his friends’ passage home and Drake takes a bold risk to help Morwenna. Geoffrey Charles and Cecily find themselves in trouble.

Geoffrey Charles and Cecily form a desperate plan and Demelza makes a discovery at the mine. With Ned’s trial looming heavy, Ross pleads for Dwight’s help.

Ross seeks vengeance, while Demelza discovers the identities of the smugglers. Caroline puts her insecurities aside to help a friend.

Several months have passed. With their lives on the line, Ross and his friends must launch their most daring plan yet, to save themselves and the country.