Helen de Guerry Simpson (1897-1940), writer, was born on 1 December 1897 in Sydney, fourth and youngest child of native-born parents Edward Percy Simpson, solicitor, and his wife Anna Maria Alexandra Guerry, daughter of the French Marquis de Guerry de Lauret. Helen grew up at her father's home, St Mervyn's, Point Piper. Her parents separated and her Catholic mother moved to London. Her father, an Anglican, sent her as a boarder to the Convent of the Sacred Heart, Rose Bay, and to Abbotsleigh. Arriving in England in April 1914, Helen joined her mother. She went to Oxford in September 1915, joining the Society of Oxford Home Students (later St Anne's College), and read French at the university (1916-17). In April 1918 she joined the Women's Royal Naval Service as a chief section officer of decoding at the Admiralty. She returned to Oxford in September 1919 to study music, intending to become a composer, and matriculated on 13 October 1920. At Oxford she became very interested in the theatre, publishing several short plays and founding the Oxford Women's Dramatic Society. Reputedly breaking strict regulations prohibiting male and female students from acting together, she was sent down without completing her degree in 1921. That year Simpson returned to Sydney for her brother's wedding. She published *Philosophies in Little* (1921), a collection of her own verse with her translations from French, Italian and Spanish. In 1922 she entered a play, *A Man of his Time* (1923), based on the life of Benvenuto Cellini, in the Daily Telegraph literary competition; it was staged next year by Gregan McMahon. At Oxford again by February 1924, she made a bet that she could write a novel in five weeks: the result was a detective story, *Acquittal* (London, 1925). Further books followed quickly: *The Baseless Fabric* (1925), a collection of short stories; *The Women's Comedy* (1926), another play set in Renaissance Italy; and *Cups, Wands and Swords* (1927), which combined her principal interests, detective fiction and demonology. Prolific and versatile, she continued to write: *Mumbudget* (1928), *The Desolate House* (1928) and *Vantage Striker* (1931). Through her publisher she became a close friend of Clemence Dane; they collaborated in three detective novels between 1928 and 1932. In 1932 she published *Boomerang* which won the James Tait Black memorial prize and marked her arrival as a significant contemporary novelist: based in part on her mother's family, it was her first book to deal with Australia. Her other literary works include *The Woman on the Beast* (1933), a fantasy partly set in Australia in 1999; the historical biographies, *The Spanish Marriage* (1933), *Henry VIII* (1934) and *A Woman Among Wild Men* (1938); works on domestic economy and cookery, *The Happy Housewife* (1934) and *The Cold Table* (1935); the historical novels, *Saraband for Dead Lovers* (1935), and *Under Capricorn* (1937) set in colonial New South Wales; and the novels, *The Female Felon* (1935) and *Maid No More* (1940). In the 1930s Simpson lectured and broadcasted on literary, historical and topical subjects. She was also deeply involved in literary society in London and belonged to the P.E.N. and the Detection clubs. Her literary friends included Dorothy Sayers, Margaret Kennedy and John Masefield. Helen Simpson died of cancer on 14 October 1940 at Overbury, near Evesham, Worcestershire. [This article was published in Australian Dictionary of Biography, Volume 11, (MUP), 1988.]