A judge, terrorized by the idea that his sister is going mad, wants to kill her. He finds a hired assassin, an actor, who instead of killing her or persuading her to commit suicide, acts in such a way that she falls in love with him. She recovers, thus inflicting madness on her brother, whose original sanity was established only when compared with the folly of his sister. And the solution, so often contemplated with regard to the sister, will be applied to the brother.