Dery (Mari Torcsik) is a grande dame actress of the Sarah Bernhardt school of big-gesture theater. Her beauty and popularity is fading, and a new school of acting which involves the use of one's own emotions (a-la Eleanora Duse) is emerging in the person of her younger Viennese rival. She thinks of retiring from the stage, and reunites briefly with her estranged husband in a newly-built manor in the country. Finding that life there is boring, she returns to town, the theater, and her old friends.
Take a cliched Horror-story beginning, a remote Gothic mansion, an insane hostess, a group of strangers (four men, three women and a gorilla) and you pretty much begin to see that this is not meant to be a serious film, but rather a parody of several other (older and better) ones.
"All Men Are Brothers" is the sequel to "Water Margin" a.k.a. "Seven Blows of the Dragon" from 1972. At the beginning of "All Men Are Brothers", we learn that the emperor forgives the 108 Liangshan rebels since he finds they have the same enemies.
Have you watched Mrs. Dery Where Are You? yet? What did you think about it?