A young woman discovers she is the daughter of the infamous Dr. Jekyll, and begins to believe that she may also have a split personality, one of whom is a ruthless killer.
Mr. Dean's body is found face down in the fireplace, burned beyond recognition. Nightclub-singer Eden Lane is convicted of the crime. She is escorted to prison by one of the arresting detectives when she convinces him that she just spotted the murderer outside their train.
A scientist develops a formula which will cause animals to regress to the form of their primitive ancestors, and tries it on himself with disastrous results.
