An American scientist is sent by the CIA to East Germany to retrieve a secret microfilm from a Soviet scientist interested in defecting to the West but the Stasi secret police's surveillance complicates matters.

Montgomery Cliftas Professor James Bower
Hardy Krügeras Counselor Peter Heinzmann
Macha Mérilas Frieda Hoffmann
David Opatoshuas Orlovsky
Christine Delarocheas Ingrid Weiß
Hannes Messemeras Dr. Saltzer
Karl Lieffenas Major Windisch
Uta Levkaas Mädchen unter der Dusche
Roddy McDowallas Agent Adams
Johannes Buzalskias Agent (uncredited)
Raoul Coutard