Veidt portrays a successful violinist, Paul Körner, who falls in love with one of his male students. A sleazy extortionist threatens to expose Körner as a homosexual. Flashbacks show us how Körner became aware of his sexual orientation and tried first to change it, then to understand it. Körner and the extortionist end up in court, where the judge is sympathetic to the violinist, but when the scandal becomes public, Körner's career is ruined and he is driven to suicide.