Blood Simple (1985)

Hired to document a routine marital betrayal in dusty Texas, private operative Loren Visser immediately spots a far dirtier angle for personal profit. His double-crossing scheme to manufacture photographic proof of a murder and assassinate his own client unleashes an avalanche of gory misunderstandings, frantic burials, and paranoid terror. Visser demonstrates how a sleazy gumshoe with a camera and a pistol can turn petty domestic rancour into an absolute slaughterhouse.