Johnny Dark is a 1954 film starring Tony Curtis as a racing car driver.
New employee Liz catches the eye of the guys. Her secret is that she is Fieldings granddaughter. When a major stockholder, Winston, protests the companys unwillingness to create new products for more profits, Scotty blurts out that Fielding Motors is developing a new sports car.Liz is chosen as the cars designer while Johnny and Duke go to work building it. Duke invites her to go dancing, but is jealous when he spots her kissing Johnny, who has discovered Lizs true identity. ........
Source: Wikipedia