What Every Woman Knows is a play written by J. M. Barrie. It tells the story of Maggie Wylie, a young Scottish woman who possesses an incredible amount of practical knowledge and common sense, which she uses to help those around her. Despite her intelligence and capabilities, she is often underestimated because of her gender. The play follows her journey as she finds love, marries, and uses her cunning and wit to secure her husband's political career. Throughout the play, Maggie proves that a woman can be just as clever and capable as any man, and that there is a place for women in the political world.