Susanna Strickland was the younger sister of authors Agnes Strickland and Catharine Parr Strickland (later Traill). She wrote her first children's book in 1822. Susanna was involved in the Anti-Slavery Society in London. In 1831, she married John Moodie, a retired officer of the Napoleonic Wars. The next year, the couple and their daughter emigrated to Canada, following sister Catharine Traill and her husband. The family settled on a farm in Douro township, near Lakefield, north of Peterborough, Upper Canada, where her brother Samuel worked as a surveyor. Susanna Moodie continued to write in Canada and her letters and journals contain valuable information about life in the colony.