Daughter of Trevenen Rosman, accountant, and his wife Alice Mary Bowyer Rosman (q.v), Alice Grant Rosman was born at 'Dreamthorpe', Kapunda, the home of her pioneer grandfather, John Varley, SM. From the age of eight she wrote poetry for competitions. She was educated at the Dominican Convent Cabra. Her first short story was published in the Adelaide Southern Cross, and she contributed numerous sketches, stories and poems to Australian anthologies, newspapers and magazines, including The Native Companion and Lone Hand. Together with Grace E. Burrows, she edited and contributed to The Young Queen (1902-1903), a mimeographed magazine containing short stories, poems and articles for 'girls ... interested in the Girls' Realm Guild and its working'. She had a page of her own in The Gadfly and contributed the Adelaide section of the Woman's Letter in The Bulletin. She had early journalistic experience with C J Dennis and A E Martin on The Gadfly, and was Adelaide correspondent on The Bulletin 1908-1911, writing as "Rosna".
In 1911 Rosman left Adelaide with her mother and sister for London, where they took a flat in Bloomsbury and she worked as a journalist, continuing to contribute to the Bulletin from there. She joined the staff of the British Australasian in 1915, and from 1920 to 1926 was assistant editor of the Grand Magazine.
In 1927 she gave up journalism and devoted herself entirely to writing fiction, producing a large number of popular romances. Her novel The Window ran to twelve editions in five months. Eight of her novels, in succession, became best sellers in the United States. At least four of her novels have Australian connections.