Sicilian baron, Mimì Galluzzo, will be able to enjoy the legacy of his deceased father-in-law on two conditions: that his wife accepts the will and that there is a compromising document to be delivered to the mafia. While, however, the precious "dossier" is, in reality, in the hands of an avid widow, Donna Maria, willing to sell it only if Mimi marries her. Rosalba, obsessed with the absence of a child, suddenly goes mad or pretends 'go crazy. Recommended by Donna Maria, of whom he became the lover Don Mimì tries, with the help of his friend Langatta, undertaker, and a nurse in the clinic in which Rosalba was hospitalized, to get rid of his wife. Instead, he finds himself without having reached his goal, involved in an obscure series of crimes that will make him lose his mind.

El barón siciliano Mimì Galluzzo podrá disfrutar del legado de su difunto suegro con dos condiciones: que su esposa acepte el testamento y que haya un documento de compromiso que se entregará a la mafia. Mientras que, sin embargo, el precioso "expediente" está, en realidad, en manos de una viuda ávida, Donna Maria, dispuesta a venderlo solo si Mimi se casa con ella. Rosalba, obsesionada con la ausencia de un niño, de repente se vuelve loca o finge que se vuelve loca.