We discuss the 80's classic: Blood Simple:

Abby is cheating on her saloonkeeper husband, Marty. The object of her affections is Ray, one of Marty's bartenders. Marty hires Visser, an unscrupulous detective, to kill them. But Visser has other, more lucrative plans of his own. So begins a calculating round of double and triple crosses that build to a bloodcurdling, surprise-filled climax.