Libby Purves meets crossword setter John Halpern; historian and travel writer John Julius Norwich; journalist Mary Kenny and actor Imogen Stubbs.

John Halpern is a crossword setter. His work features in the Guardian (under the name Paul), the Financial Times (as Mudd) and the Times (Anon). His new book, The Centenary of the Crossword, starts with the story of Arthur Wynne - a journalist from Liverpool who created the first crossword on December 21 1913. The book includes inside information about how crosswords are compiled, tips for solving different types of clues and examples of puzzles from prominent setters around the world. The Centenary of the Crossword is published by Andre Deutsch.

John Julius Norwich is an historian, travel writer and broadcaster. The only son of Lady Diana and Duff Cooper, his new book features correspondence from his mother between 1939 and 1952. The letters recount her experiences during the Blitz and life with her society friends Evelyn Waugh and the Mitfords. Darling Monster - The Letters of Lady Diana Cooper to Her Son John Julius Norwich is published by Chatto & Windus.

Mary Kenny is an Irish journalist, author, playwright and broadcaster. She has written for over 25 newspapers over a career spanning four decades. In her new book she recalls her life from her days as a young reporter for the London Evening Standard to coping with the responsibility of being a full time carer for her husband. Something of Myself and Others is published by Liberties Press.

Imogen Stubbs is an actor and writer. She discovered her passion for acting while studying at Oxford University. She is best known for her stage performances with the Royal Shakespeare Company, notably as Desdemona in Othello opposite Willard White which was directed by Trevor Nunn. She is currently starring in Strangers on a Train by Craig Warner at the Gielgud Theatre, London.

Producer: Paula McGinley.