A story about secret services, war and love. It is 1945, the last months of WWII. The American and Soviet intelligence agents are desperately looking for a secret apparatus – a device used by Germans to decipher Soviet telegrams. It seems that the device may influence the result of the war and the events in the post-war era. The main character Johann Jorg is a specialist who operates the device hidden in a secret base in Czoch castle. He can count on Natalia who is a radio-telegraph operator. She is a German whose father was murdered by Gestapo. That is why she has been acting against the Nazi. She has a secret crush on Jorg while he seems to be attracted to Anna Maria who is a niece of the castle owner. Suddenly, Natalia is arrested and forced to co-operate with the Nazi.