Klute
This thriller stars Jane Fonda as Bree Daniel, also a New York City call girl who becomes enmeshed in an investigation into the disappearance of a business executive. It appears he hasn't been the only person on her course, and eventually begins a romance with her, although detective John Klute is hired to follow Daniel. It's up for her and Klute to figure out who is after her before it's too late when it becomes evident that Daniel has been targeted.