The present study analyzes the representation of human nature in ''Delitto all'isola delle capre'' (1948) by Ugo Betti. The aim of this article will be achieved through a critical and analytical study of the tragedy: to show the co-presence of Good and Evil, as essential entities in the Bettian man, who carries with him the condemnation of a sin and an existential guilt so much heavy as possible expiation. In fact, Betti's characters face their existence, characterized by the perennial conflict between the real and the ideal that is both aspired to and impossible to achieve, in a state of solitude and anguish that leads them to perform the lowest actions of human nature. However, it is in this scenario of humanity that the writer allows us to glimpse a glimmer of light for his characters, through a hope in religion which however points to a probable, and therefore not certain, way out in the world of the afterlife and not in earthly life because the Bettian God is a God who silently witnesses human decay.