Background
Middlemass was the daughter of Robert Hume Middlemass (of the Westbarns of Haddington), and Mary Porter in Marylebone, London, England.
Middlemass was the daughter of Robert Hume Middlemass (of the Westbarns of Haddington), and Mary Porter in Marylebone, London, England.
Her first works were published under the pseudonym Mignionette, by her father in 1851. She published prolifically from the 1870s through to when her last book was published in 1910, and was one of the authors of the collaborative work The Fate of Fenella.