An English spy is sent to Berlin in 1961 to sift out a traitor in the UK Embassy or among the Allies, shortly before the construction of the Berlin Wall.An English spy is sent to Berlin in 1961 to sift out a traitor in the UK Embassy or among the Allies, shortly before the construction of the Berlin Wall.An English spy is sent to Berlin in 1961 to sift out a traitor in the UK Embassy or among the Allies, shortly before the construction of the Berlin Wall.