Despite the successes of her earlier fiction, Glaspell would be most remembered for the twelve groundbreaking plays she submitted to the company over the next seven years. Her first play, "Trifles" (1916), was based on the murder trial she had covered as a young reporter in Des Moines. Today considered an early feminist masterpiece, it was an instant success, riveting audiences with its daring views of justice and morality. It has since become one of the most anthologized works in American theatre history. In 1921 she completed "Inheritors"; following three generations of a pioneer family, it is perhaps America's first modern historical drama. This same year she also finished "The Verge", one of the earliest American works of expressionist art.