The Thief Who Came to Dinner

Computer programmer Webster McGee (Ryan O'Neal) is so bored at his job that he begins a sideline career as a thief. When he steals incriminating documents from a local tycoon named Henderling (Charles Cioffi), Webster blackmails his victim into helping him up the social ladder. Soon he finds himself hobnobbing with the fast set and falling in love with a beautiful socialite (Jacqueline Bisset). Everything would be great if a dogged insurance investigator (Warren Oates) weren't on to him.