It's 1796, and to defend Cornwall and those he loves from an empowered George, Ross Poldark must play the political game on a journey that takes him to the nation's capital and into new perils.
Ross faces successive failures in Westminster and he is advised to take a slier approach.
George finds the opportunity to ruin a business rival and the Poldarks in the process.
Elizabeth hopes to persuade George that Valentine is his child. Ross must mend things with Demelza.
The Poldarks are determined to get their relationship on track. The Enyses are expecting a child.
While George continues plotting his return to Westminster, Ross is reunited with his family at home.