In the time of the cold war, more than 50 years ago, a spy is sent on a mission - a mission so secret that only 5 people are aware of the extraordinary secret that someone is trying to hide.

There are to be no allowances; no compromises. Any witnesses must be eliminated..... A small boy stands on the edge of a cliff top, watching....

The boy survives... but the mission fails. Buried alive in a dark cave that is part of a network of tunnels, the spy awaits his fate...