""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, an English philanthropist and founder of the Mothers' Union, a Christian organization dedicated to supporting mothers and families. The biography covers Sumner's early life, her marriage and family, and her work with the Mothers' Union. The book also explores Sumner's religious beliefs and how they influenced her...