The Betsy(1978)

90-year-old Loren Hardeman is the head of an American car manufacturing dynasty. He has given his grandson control of the family business, but still has one project that he desperately wants the company to complete for him. Loren's dreams of an efficient, economical car to be called The Betsy after his great-grandaughter, and he hires injured race car driver Angelo Perino to design it in secret. But Loren d sn't know that Angelo is also seducing Betsy, as well as having an affair with his grandson's mistress, and that his project is not a secret from rest of the auto industry who are determined to sabotage it.