Margaret Edith Newman was born on 21 June 1926 in Harrow, Middlesex, London, England, UK, the eldest daughter of Marjory Edith (Donald), a former teacher, and Bernard Newman, author of fiction and non-fiction books and considered an authority on spies. She had two sisters, Hilary (Mrs. Richard Hipkin) and Lauriston (Mrs. Malcolm Norris). She was educated at Harrow County School for Girls, from 1937 to 1944; and studied her Major scholar at St Hugh's College, Oxford form 1944 to 1947, she aslo earned her B.A. in 1947 and her M.A. in 1952. On 11 February 1950, she married (Ronald) Jeremy Potter, a publisher and later also published writer of mystery novels. They had a daughter, Jocelyn, and a son, Jonathan.
Before writing, she worked in various jobs, as teacher in Egypt and England, from 1947 to 1950; as editor at King's Messenger children's magazine in London, from 1950 to 1955; and as adviser at Citizen's Advice Bureau in Twickenham, Middlesex, from 1962 to 1970.
On 1959, she published her first mystery novel, Murder to Music as Margaret Newman. Her next novels were published under the pseudonym of Anne Betteridge, a tribute to her father's pseudonym Don Betteridge. Under her married name, Margaret Potter, she published Children's fiction. Under the pseudonym Anne Melville, she signed her historical novels since 1977. As Margaret Evans, she published two historical novels. She continued publishing until her death.
Widow since 15 November 1997, she died less than a year later on 26 August 1998 in Oxford, Oxfordshire.