A drifter named Frank Chambers arrives at a rural California diner owned by Greek immigrant Nick Papadakis and his attractive young wife, Cora. Frank and Cora quickly become attracted to each other, sparking a passionate and illicit affair. Eager to start a new life together, they plot to murder Nick, hoping to make the crime look like an accident. Despite their differences and occasional doubts about each other, their desire and desperation keep them committed to their dangerous plan.

As the scheme unfolds, Frank and Cora face numerous obstacles and close calls. Their growing mistrust and the looming presence of law enforcement add tension to their already tumultuous relationship. The initial simplicity of their plan unravels as complications mount, leading to unforeseen consequences that test their loyalty and resolve. The plot focuses on their struggle to maintain control over their lives while grappling with the moral and ethical ramifications of their actions.