Amanda by Night (1981)

A killer is stalking top class prostitute Amanda Heather. Two of her co-workers are murdered after visiting a client and Detective Ambrose Hart is brought in. He feels that the cases are linked and that Amanda is also in danger. However, Amanda has no use for police and will not cooperate with him. Finally his charms get her to agree to work together to get the murderer, Unfortunately, when Amanda finally confronts the culprit, the detective has been delayed. Thus Amanda must deal with the murderer herself.