A man disguised, falls of his horse, suffers from hallucinations and from that moment on he believes that he is in reality the person that his mask illustrates. One day he is cured, understand what has happened, but as he has been disgusted by people, decides to continue pretending to be the crazy ''Enrico'', staying thus away from the world. Pirandello sets up marvelously his game to reach again the tragedy. Enrico, led by his passion will kill and will be forced to continue impersonating the mad man, so as to avoid the consequences of his actions.