
UNEARTHING CLUES NO HUMAN EYE COULD DETECT.. TO DESTROY KILLERS NO BULLETS COULD STOP!
Scientists assembled to prove their methods are effective in criminal investigation try to solve a series of murders.

Bruce Bennett
Patrick Norris

Florence Rice
Lola Hobbs

Barton MacLane
Sam O'Donnell

Joe Downing
Lou Boyd

Joseph Crehan
Police Chief Hobbs

Howard Hickman
Dr. Talbot

Edward Van Sloan
Prof. Holtz
P.J. Kelly
Prof. Cordet

Don Beddoe
Maj. Blaine

William Forrest
Mr. Brooks
Dantón Ferrero
Mr. DeSoto
George Anderson
Detective Bennett

Duke York
Joe Carpa

Eddie Laughton
Henchman Bishop

George Magrill
Henchman Scarlatti