On the Border of Betrayal(1968)

Original title: Στα σύνορα της προδοσίας

A secret agent of the Soviets who works at Ka-Ge-Be, Georgi Dimitrijevic, comes to Greece in order to extract information about a secret base of NATO missiles. He meets a teacher from a neighboring village, whose cousin is a major of Greek counterintelligence, Konstantinos Dimou. The Major has undertaken to find and capture the dangerous spy.