In the midst of World War II, an unusual revelation about Gen. Alex Schottland (Jack Hawkins), a prominent member of the Third Reich's inner circle, raises the eyebrows of the obsessive Lt. Reinisch (Erik Schumann). After Reinisch alerts Schottland's superiors about a potentially traitorous connection to the enemy, the "German" general struggles to keep secret his true identity: He is Alex Scotland, a brave spy working undercover on behalf of the British.