Move to Cornwall
Morwenna was unhappy with the match, because she did not love her potential suitor. She met with Drake, and they kissed but she failed to tell him of what George wanted.
Geoffrey Charles and Morwenna have been entertained by watching the toads that Drake Carne has put in George Warleggan pond annoy him. As to Drakes surprise Ross Poldark had already played a toad trick on him at school as George would not accept that his grandfather was a blacksmith and unstinting he wanted nothing to do with the man which Ross and Francis Poldark found absurd. But the drastic consequences is that George and Elizabeth find out Drake put them in the pond and that he and Morwenna are in love.
Just when Morwenna thinks she can marry Drake George puts him on trial as a capital offence 'stealing' a Bible which Geoffrey Charles offered as a gift. Morwenna was forced to marry Mr. Whitworth as George threatened her by saying if she didn't marry him then Drake will hang. It ends with Drake, Demelza Poldark and Ross Poldark running to church to stop it but they are already married.
Morwenna is forced into an abusive marriage with Osbourne Whitworth. Osborne is a horrible man whom she refers to Demelza Poldark as a monster. She ends up pregnant with his child. Osbourne continues to sexually abuse her until she become extremly ill. Dwight Enys comes to check on Morwenna and confirms that she is ill and that Osbourne must abstain. He refuses.
Morwenna's sister Rowella Chynoweth arrives to help Morwenna with her step-daughters. Osbourne and Rowella sleep together while Morwenna is ill. When Morwenna is in labour, Osbourne prays that Morwenna will die. On the news of his sons birth, he assumes her to be dead.
Osborne continues to sleep with Rowella which results in a pregnancy. Rowella covers up her pregnancy by asking to marry a librarian. They ask for £1000 but eventually agree on £500.
Morwenna overhears the arrangement and confronts Osbourne. He wants to assume marital relations and essentially continue sexually assulting Morwenna. Morwenna threatens to kill her son, John, by smothering him. Osbourne leaves in a panic. Morwenna then reveals that she would never hurt John and was doing it to protect herself.
At the end of the finale we see Drake Carne leave a bunch of flowers at Morwennas door. She assumes they are from him and knows he is nearby. She tells him she loves him before going back inside.