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Great Britain
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Synopsis
When students Alex and Patricia (David Ladd and Sharon Gurney) discover a dying man in their local underground station, they spark off an investigation that reveals a sinister and macabre plot that even turns the stomachs of hardened police officers Colquhoun and Rogers. Prominent people, it seems, have been disappearing from London tube stations, and an MI5 agent (Christopher Lee) is called in to help solve the deepening mystery. What is the terrible secret of the capital's underground system? And who - or what - is turning the tube tunnel into a DEATH LINE?
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