Professor Henry Higgins (Howard) works to make a pretty flower girl (Hiller) into a young lady of society.

Passion, intrigue, adventure, love-- everything happens in the yellow Rolls-Royce, a luxury automobile that ties together three stories as it passes from owner to owner. In the first, an aristocrat with a penchant for the racetrack discovers his wife has a penchant for backseat amour. Then a moll takes a spin down lover's lane in the Rolls while her mobster boyfriend is busy rubbing out the competition. Finally, an imperious widow purchases the car...