Cold War East Germany. The military develops an insidious plan to destroy NATO ships, for which they kidnap scientist Dr. Flammond, lock him in a dungeon, forcing him to create a Polaris mine. An international festival, to which artists from different countries are invited, serves as a cover for his criminal schemes. Nick Rivers, a rock singer, arrives from America and meets the charming Hillary, Flamond's daughter. She is a member of the underground resistance, which attracts Nick.