Winslet will star in the director’s latest film, The Guernsey Literary and Potato Peel Pie Society.
Branagh has described the project as “a beautiful romance, very touching and uplifting.”
The film is to be based on the best-selling 2008 book by Mary Ann Shaffer and her niece Annie Barrows, who helped her finish the book after she became terminally ill. The writer eventually died aged 74, a few months before the novel was published.
Set after World War II, the story is about a magazine columnist, Juliet Ashton, who learns how Guernsey islanders created a book group during the war to outwit their German occupiers.
After exchanging letters with a pig farmer who uncovers evidence of the book club in the modern day, Ashton becomes so capitvated by the story she travels to Guernsey, where she delves deeper into the lives of the islanders and experiences things that change her life forever, said the BBC.