Mollie Greenhalgh Hardwick (7 March 1916 in Prestwich, Lancashire – 13 December 2003), also known as Mary Atkinson, was an English author who was best known for writing books that accompanied the TV series Upstairs, Downstairs. She married fellow author Michael Hardwick in 1961 and together they co-wrote numerous books, mostly relating to Sherlock Holmes but also a number on Charles Dickens. The couple lived in a medieval house in a village in Kent. She died after a fire broke out at her flat in Muswell Hill, London in 2003.