Industrialist François Delambre is called late at night by his sister-in-law, Helene, who tells him that she has just killed her husband. Reluctant at first, she eventually explains to the police that he invented a matter transportation apparatus and, while experimenting on himself, a fly entered the chamber.


François Delambre

Herbert Marshall
Insp. Charas

Kathleen Freeman
Emma

Betty Lou Gerson
Nurse Andersone

Charles Herbert
Philippe Delambre

Eugene Borden
Dr. Ejoute (uncredited)