

When a government official disappears in the London tunnels, after several reports of missing people in the same location, Scotland Yard start to take the matter seriously, along with a couple who stumble into a victim by accident.
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Cast

Donald Pleasence
Inspector Calhoun

Norman Rossington
Det.Sgt. Rogers

David Ladd
Alex Campbell

Sharon Gurney
Patricia Wilson
Hugh Armstrong
The "Man"
June Turner
The "Woman"

Clive Swift
Inspector Richardson

James Cossins
James Manfred O.BE.
Heather Stoney
P.C.W. Alice Marshall
Hugh Dickson
Dr. Bacon

Christopher Lee
Stratton-Villiers, MI5
Jack Woolgar
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