A mysterious murderer has already killed seven people using the deadly venom of a snake from Martinique which causes immediate death with the victim's face turning into a horrible mask. A young and ingenious police lieutenant is called on the case
Bob Rawling
Betty
Inspector Sanders
Susan
Mrs. Sanders
Harriet Anderson
Harry Francis
Mirta Francis
Chief of Police (as Giorgio Ardisson)
Julie Garrett (as Jeannette Len)
The Narrator