Body Heat (1981)

Directed by Lawrence Kasdan and starring William Hurt and Kathleen Turner, the film follows a lawyer who becomes involved in a relationship with a married woman that leads to a planned murder. Set in Florida, the story centers on deception, manipulation, and criminal intent. The film is associated with the revival of classic film noir elements in modern cinema.

Från IMDB:
During an extreme heatwave, a beautiful Florida woman and a seedy lawyer engage in an affair while plotting the murder of her rich husband.