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.

Top Cast

Donald PleasenceInspector Calhoun

Norman RossingtonDet.Sgt. Rogers

David LaddAlex Campbell

Sharon GurneyPatricia Wilson

Hugh ArmstrongThe "Man"

June TurnerThe "Woman"

Clive SwiftInspector Richardson

James CossinsJames Manfred O.BE.