All the occupants of a home are obsessed by the feeling that someone is trying to kill them. When an attempt is made, the identification and solution of the killer and crime is blocked by an attack of amnesia suffered by the housekeeper.
A photographer whose camera photographs subjects as they were five years previously is called to "shoot" a young couple. He finds some startling results upon developing the film.
A reporter's search for the murderer of the community's leading citizen is confused by the dying man's last words, "who would have dreamed it --- a Dr. Jekyll."