E. X. Ferrars was born Morna Doris MacTaggart on September 6, 1907. Although born in Rangoon, Burma (at that time a British protectorate), she lived most of her life in Scotland and was in character and style firmly British. She attended Bedales School in Hampshire from 1918 to 1924 and University College, London, from 1925 to 1928. She received a diploma in journalism from the latter institution in 1928.
In 1940, MacTaggart (Ferrars) married Robert Brown, a Scottish academic. In the year of her marriage, she began her long career as a writer of detective fiction, adopting her mother’s maiden name, Ferrars, as her pseudonym.
Besides her prolific output of novels and stories, Ferrars played an active role in organizations of crime writers. She was a founding member of the Crime Writers’ Association in 1953. She was also a member of the Detection Club and the Mystery Writers of America. Throughout her career, Ferrars continued to produce a similar type of story. Her writing career lasted for more than forty-five years.