Dr. Jekyll and Mr. Hyde (character) (Fredric March), a kind English doctor in Victorian London, is certain that within each man lurks impulses for both good and evil. He is desperately in love with his fiancée Muriel Carew (Rose Hobart) and wants to marry her immediately. But her father, Brigadier General Sir Danvers Carew (Halliwell Hobbes), orders them to wait. One night, while walking home with his colleague, Dr. John Lanyon (Holmes Herbert), Jekyll spots a bar singer, Ivy Pierson (Miriam Hopkins), being attacked by a man outside her boarding house. Jekyll drives the man away and carries Ivy up to her room to attend to her. Ivy tries to seduce Jekyll but, though he is tempted, he leaves with Lanyon.