Katharine Susannah Prichard was born in Levuka, Fiji in 1883, and spent her childhood in Launceston, Tasmania, before moving to Melbourne, where she won a scholarship to South Melbourne College. Her father, Tom Prichard, was editor of the Melbourne Sun newspaper. She worked as a governess and journalist in Victoria then travelled to England in 1908. Her first novel, The Pioneers (1915), won the Hodder & Stoughton All Empire Literature Prize. After her return to Australia, the romance Windlestraws and her first novel of a mining community, Black Opal were published.
Prichard moved with her husband, war hero Hugo "Jim" Throssell, VC, to Greenmount, Western Australia, in 1920 and lived at 11 Old York Road for much of the rest of her life. She wrote most of her novels and stories in a self-contained weatherboard workroom near the house. In her personal life she always referred to herself as Mrs Hugo Throssell. She had one son, Ric Throssell, later a diplomat and writer.