Frank Chambers is a fictional character from the novel "The Postman Always Rings Twice," written by James M. Cain. He is portrayed as a drifter who becomes involved in a passionate and tumultuous affair with Cora Smith, the wife of a diner owner. Frank's character embodies themes of desire, betrayal, and moral ambiguity. Throughout the story, Frank's choices lead to a series of dramatic events, including a plot to murder Cora's husband. His actions ultimately reflect the darker aspects of human nature and the consequences of impulsive decisions. The novel is a classic example of noir fiction, highlighting the complexities of love and crime.