Industrialist François Delambre is called late at night by his sister-in-law, Helene Delambre, who tells him that she has just killed her husband, André. Reluctant at first, she eventually explains to the police that André invented a matter transportation apparatus and, while experimenting on himself, a fly entered the chamber during the matter transference.
David Hedison
as Andre Delambre
Patricia Owens
as Helene Delambre
Vincent Price
as François Delambre
Herbert Marshall
as Insp. Charas
Kathleen Freeman
as Emma
Betty Lou Gerson
as Nurse Andersone
Charles Herbert
as Philippe Delambre
Eugene Borden
as Dr. Ejoute (uncredited)
George Calliga
as Club Member (uncredited)
Harry Carter
as Orderly (uncredited)
Bill Clark
as Policeman (uncredited)
Arthur Dulac
as French Waiter (uncredited)
