""Mary Sumner: Her Life and Work"" is a biography written by Mary Porter and published in 1921. The book tells the story of Mary Sumner, a British philanthropist and founder of the Mothers' Union, a Christian organization that supports mothers and families. The biography covers Sumner's life from her childhood in Winchester to her work with the Mothers' Union, which began in 1876. The book also explores Sumner's religious beliefs and her dedication...