When linguistics professor Henry Higgins boasts that he can pass off Cockney flower girl Eliza Doolittle as a princess with only six months' training, Colonel George Pickering takes him up on the bet. Eliza moves into Higgins's home and begins her rigorous training after the professor comes to a financial agreement with her dustman father, Alfred. But the plucky young woman is not the only one undergoing a transformation.

Judy Aalders grows up in an orphanage. Albert Woudenberg happens to be present when Judy confronts the trustees of the orphanage and is expelled. He decides to send her to university and Judy, who has only ever seen his shadowy long legs, refers to him as 'Daddy-Long-Legs' from that day. Not knowing he is in fact her benefactor, Judy's relationship with Albert gradually turns into love.