Klute - 1971

This thriller stars Jane Fonda as Bree Daniel, '' a New York City call girl who becomes enmeshed in an investigation into the disappearance of a business executive. Detective John Klute is hired to accompany Daniel, and eventually begins a romance with her, but it seems that he hasn't been the sole real person on her road. When it becomes clear that Daniel will be targeted, it's up to Klute and her to figure out who is after her until it's too late.