The temp (1993)

Peter Derns, an executive at Mrs. Appleby's Cooke Company, fears his future prospects are crumbling fast, until the arrival of Kris Bolin, a gorgeous, cooly efficient temp - and sultry temptress - who helps him develop a marketing campaign that slays the competition. But after two executives mysteriously die, Peter discovers his job security may vanish due to the one person he needs to trust: his temp.