Nicholas Hugh Sebag-Montefiore (born 5 March 1955) is a British writer. He trained as a barrister before becoming a journalist and then a non-fiction writer. His second book Dunkirk: Fight to the Last Man was published in 2006. His previous book is Enigma: The Battle for the Code, the story of breaking the German Enigma machine code at Bletchley Park during the Second World War (Weidenfeld & Nicolson, 2000). His family owned Bletchley Park until they sold it to the British government in 1938. In 2016, Somme: Into the Breach appeared in time for the 100th anniversary of the Somme Offensive. Cecil Sebag-Montefiore, the author's great-grandfather, took his own life after serving with the Royal Engineers on the Western Front. He has been married since 1989 to Aviva Burnstock, the head of the Department of Art Conservation & Technology at the Courtauld Institute in London. His brother Simon Sebag Montefiore is also a writer, besides being an historian. His cousin Denzil was a platoon commander at Dunkirk.