'Poldark' bosses have confirmed the forthcoming fifth series will be the show's last.
Debbie Horsfield, who wrote the fourth series, has revealed the upcoming season will be based between 1800 and 1810, which takes place in between Winston Graham's seventh novel, 'The Angry Tide' - on which series four was based - and his eighth novel, 'The Stranger from the Sea'.
She said: "In 'The Stranger from the Sea' Winston Graham made many references to developments that happened in the 'gap' years. Much can also be inferred.
"There are, of course, also historical events and people of the time, both in Cornwall and in London.
"Series five will draw on all of these to follow the lives of the Poldarks, George Warleggan, the Enyses, and the Carnes in this intervening period."
Andrew Graham, Winston's son and series consultant on the show - which sees Aidan Turner play titular character Ross Poldark - admits he isn't sure how his father would've felt about the upcoming season being based on something which he didn't write, but believes the show is in "safe hands" with Debbie.
He said: "No-one can know what my father would have felt about the forthcoming series, let alone what he might have written.
"However, Debbie Horsfield has demonstrated such an extraordinary affinity with his work and shown such remarkable skill in bringing his Poldark characters to the screen that we know we are in safe hands.
"Indeed, without her, the [Winston Graham] Estate would not have agreed to series five in this form."
As well as Aidan, Eleanor Tomlinson will return as Demelza Poldark, Jack Farthing is back as George Warleggan, and several other stars, Luke Norris (Dr Dwight Enys), Gabriella Wilde (Caroline Enys), Ellise Chappell (Morwenna Carne), Harry Richardson (Drake Carne), Tom York (Sam Carne), and Beatie Edney (Prudie), will also return.
What's more, several stars have joined the cast for the upcoming series, including Lily Dodsworth Evans, Kerri McLean, Sofia Oxenham, Vincent Regan, Peter Sullivan, and Freddie Wise, but their roles are not yet known.
Poldark's fifth series will air in 2019.
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