At the age of seven, her parents adopted de la Roche's orphaned younger cousin Caroline Clement, who joined in her fantasy world game and would become her lifelong companion. The two lived a fairly reclusive life; their relationship was not discussed widely in the press. In 1931 they adopted two children whose parents were friends of Clement and de la Roche and who had died.
De la Roche had her first story published in 1902 in Munsey's Magazine but did not begin her writing career in earnest until after the death of her father. Her first two novels, Possession (1923) and Delight (1926), were romantic novels and earned her little in income or recognition. Her third novel, Jalna, was submitted to the American magazine Atlantic Monthly, winning a $10,000 award. Its victory and subsequent publication in 1927 brought de la Roche fame and fortune at the age of 48.
The Jalna series has sold more than eleven million copies in 193 English and 92 foreign editions. In 1935, the film Jalna, based on the novel, was released by RKO Radio Pictures and, in 1972, a CBC television series was produced based on the series. Mazo de la Roche is buried near the grave of Stephen Leacock at St. George's Anglican Church, at Sibbald Point, near Sutton, Ontario.
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