Ross plunges into a highly speculative mining venture which threatens not only his family's financial security but also his turbulent marriage to Demelza. When Ross and Elizabeth's old attraction rekindles itself, Demelza retaliates by becoming dangerously involved with a handsome Scottish cavalry officer. With bankruptcy an increasingly real possibility, the Poldarks seem to be facing disaster on all fronts.

Cornwall, 1812: At Nampara, the Poldark family finds the new year brings involvement in more than one unexpected venture. For Ross and Demelza there is some surprising - and worrying - news. And Clowance, newly returned from her London triumphs, finds that her entanglement with Stephen Carrington brings not only happiness but heartache. As the armies battle in Spain, and the political situation at home becomes more obscure daily, the Poldark and Warleggan...