Sarah Blake is an American writer based in Washington D.C. She is known for her historical fiction novels that span different time periods and settings. Her debut novel, Grange House, was published in 2001 and is set in Victorian era Maine. Her second novel, The Postmistress, followed in 2010 and takes place during the Second World War, with scenes set in both Massachusetts and London. In 2019, she published her third novel, The Guest Book, which tells the story of two intertwined families across twentieth-century Germany and the United States.