Summer 1942. Nazi troops storm the Caucasus. They are rushing to get their hands on Baku oil. An Abwehr special group called "Wartburg" has settled in the Nalchik area. In Baku, German spy Ziegel (Pavel Kadochnikov) heads to the oil fields from Maykop under the name of Soviet engineer Kashtanov. Tankers carrying gasoline begin to explode in the Caspian Sea. Soviet counterintelligence agent "Khazri" infiltrates "Wartburg"...