Police try to track down a hooded serial killer who murders his victims with a combination of acid and poison gas.
as Inspektor Higgins
as Ann Portland
as Betty Falks
as Sir John
as Keyston
as Mark Denver
as Harriet Foster
as Secretary
as Frank Keeney
as Glenn Powers
as Greaves
as Bannister
as Harrison
as Brent
as Sergeant Hanfield
as Cress Bartling
as Dr. Shinewood
as Carrington
as Mary Houston
as June Bell
as Mildred Miller
as Pam Walsbury
as Busschaffner
as Winston Robson
as Dr. Cabble
