The focus of this essay is to explore the dark side of human nature which is portrayed by the characters of Frank and Cora in The Postman Always Rings Twice. In order to do so, the novel will be analyzed by drawing on New Criticism as an approach. In this respect, a close reading will be done with the hopes of finding how all the elements of the novel work at unison to build up the core of theme of the novel. Therefore; for this monograph, the subjects of sex, success, betrayal and love and how these interact within the novel will be explored in order to identify how these elements drive the characters to their most depraved moral perspective