The Postman Always Rings Twice (1946)

Drifter Frank Chambers arrives at a quiet California roadside restaurant where he meets and falls for drop-dead gorgeous Cora, the wife of restaurant owner Nick Smith. After weaseling his way into a job, the two begin a deadly love affair and cook up plans to end her marriage and start a new life together. After a few botched attempts at a clean break, they are forced to put their honeymoon on hold after being rerouted into the arms of a D.A. hot to convict and a corrupt lawyer with designs on Cora. Frank and Cora thought they packed just enough luck to avoid what should be unavoidable but the duo failed to account for the possible intervention of a formidable force that doesn't need a badge.