Ross returns home to Cornwall from the war with the French and soon renews his feud with the Warleggans.
Elizabeth celebrates the birth of her son but worries that there was a Dark Moon at the time of his birth. Meanwhile, word arrives that Dwight Enys is missing at sea.
Ross is captured as a spy when he goes to France in search of Dwight Enys.
Demelza gives birth to a daughter. George arranges a marriage between Morwenna and Osborne Whitworth unaware that she's in love with Drake Carne.
As Aunt Agatha prepares a party for her 100th birthday, Ross prepares to rescue Dwight Enys from French custody. Neither the rescue nor the party go as planned.
Aunt Agatha's deathbed curse haunts George while Ross brings Dwight Enys and Hugh Armitage back to Cornwall.
Ross decides not to stand for Parliament but George Warleggan decides to throw his hat into the ring.
Demelza discovers that Ross had a secret meeting with Elizabeth while fighting her own attraction to Hugh Armitage.
Ross is unable to help miners who are facing starvation because of a strike. Rowella blackmails Osborne.
Ross gets elected to Parliament. Hugh Armitage dies of a brain tumor. Osborne tries to have Morwenna committed to an asylum.
George continues to scheme for more power by planning to bankrupt Ross.
Demelza takes a huge risk to help out an old friend. Drake wants to marry Morwenna now that she's free.
Tragedy could be awaiting Ross, Elizabeth, and Demelza on their respective trips to London.