Dr. John Garth conducting an innovative medical experiment aimed at prolonging life and combating aging. The experiment takes an unexpected turn, placing the doctor in a confrontation with the ethics of his work and the consequences of his research.

This movie shows the idealized career of the singer Al Jolson. A little Jewish boy comes up against the will of his father to be in showbiz, becomes a star, falls in love with a dancer not of his religion and marries her. But in the end he chooses success on the stage.